diff --git a/core/config/schema/core.extension.schema.yml b/core/config/schema/core.extension.schema.yml
index 9565d8a..7bf3749 100644
--- a/core/config/schema/core.extension.schema.yml
+++ b/core/config/schema/core.extension.schema.yml
@@ -24,9 +24,6 @@ core.extension:
           current:
             type: string
             label: 'Currently installed version'
-          install:
-            type: string
-            label: 'Version at install time'
           schema:
             type: string
             label: 'Currently installed schema version'
diff --git a/core/lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php
index e795080..18ead25 100644
--- a/core/lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php
@@ -153,10 +153,10 @@ protected function validateModules(ConfigImporter $config_importer) {
         );
         $config_importer->logError($message);
       }
-      if ($core_extension['versions'][$module]['install'] !== $module_data[$module]->info['version']) {
+      if ($core_extension['versions'][$module]['current'] !== $module_data[$module]->info['version']) {
         $config_importer->logError($this->t(
           'Unable to install the %module module since the installed version (@config_version) does not match the code base (@code_version).',
-          ['%module' => $module, '@config_version' => $core_extension['versions'][$module]['install'], '@code_version' => $module_data[$module]->info['version']]
+          ['%module' => $module, '@config_version' => $core_extension['versions'][$module]['current'], '@code_version' => $module_data[$module]->info['version']]
         ));
       }
     }
@@ -225,10 +225,10 @@ protected function validateThemes(ConfigImporter $config_importer) {
           $config_importer->logError($this->t('Unable to install the %theme theme since it requires the %required_theme theme.', array('%theme' => $theme_name, '%required_theme' => $required_theme_name)));
         }
       }
-      if ($core_extension['versions'][$theme]['install'] !== $theme_data[$theme]->info['version']) {
+      if ($core_extension['versions'][$theme]['current'] !== $theme_data[$theme]->info['version']) {
         $config_importer->logError($this->t(
           'Unable to install the %theme theme since the installed version (@config_version) does not match the code base (@code_version).',
-          ['%theme' => $theme, '@config_version' => $core_extension['versions'][$theme]['install'], '@code_version' => $theme_data[$theme]->info['version']]
+          ['%theme' => $theme, '@config_version' => $core_extension['versions'][$theme]['current'], '@code_version' => $theme_data[$theme]->info['version']]
         ));
       }
     }
diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index afd9bd2..5ab9c85 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -303,7 +303,6 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
         $info = \Drupal::service('info_parser')->parse($list[$module_name]->getPathname());
         $versions[$module_name] = [
           'current' => $info['version'],
-          'install' => $info['version'],
           'schema' => (string) drupal_get_installed_schema_version($module_name),
         ];
       }
diff --git a/core/lib/Drupal/Core/Extension/ThemeInstaller.php b/core/lib/Drupal/Core/Extension/ThemeInstaller.php
index 006eb94..5bae419 100644
--- a/core/lib/Drupal/Core/Extension/ThemeInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ThemeInstaller.php
@@ -173,7 +173,6 @@ public function install(array $theme_list, $install_dependencies = TRUE) {
       $versions = $extension_config->get('versions');
       $versions[$key] = [
         'current' => $theme_data[$key]->info['version'],
-        'install' => $theme_data[$key]->info['version'],
       ];
       ksort($versions);
       $extension_config
diff --git a/core/modules/config/src/Tests/ConfigImportInstallProfileTest.php b/core/modules/config/src/Tests/ConfigImportInstallProfileTest.php
index 19ee917..4f8553a 100644
--- a/core/modules/config/src/Tests/ConfigImportInstallProfileTest.php
+++ b/core/modules/config/src/Tests/ConfigImportInstallProfileTest.php
@@ -71,8 +71,8 @@ public function testInstallProfileValidation() {
     unset($core['versions']['stark']);
     $core['theme']['stable'] = 0;
     $core['theme']['classy'] = 0;
-    $core['versions']['stable'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION];
-    $core['versions']['classy'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION];
+    $core['versions']['stable'] = ['current' => \Drupal::VERSION];
+    $core['versions']['classy'] = ['current' => \Drupal::VERSION];
     ksort($core['versions']);
     $sync->write('core.extension', $core);
     $sync->deleteAll('syslog.');
diff --git a/core/modules/config/src/Tests/ConfigImportUITest.php b/core/modules/config/src/Tests/ConfigImportUITest.php
index 2ad8896..7c64dbf 100644
--- a/core/modules/config/src/Tests/ConfigImportUITest.php
+++ b/core/modules/config/src/Tests/ConfigImportUITest.php
@@ -84,13 +84,13 @@ function testImport() {
     $core_extension['module']['action'] = 0;
     $core_extension['module']['ban'] = 0;
     $core_extension['module'] = module_config_sort($core_extension['module']);
-    $core_extension['versions']['action'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION, 'schema' => '8000'];
-    $core_extension['versions']['ban'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION, 'schema' => '8000'];
+    $core_extension['versions']['action'] = ['current' => \Drupal::VERSION, 'schema' => '8000'];
+    $core_extension['versions']['ban'] = ['current' => \Drupal::VERSION, 'schema' => '8000'];
     // Bartik is a subtheme of classy so classy must be enabled.
     $core_extension['theme']['classy'] = 0;
     $core_extension['theme']['bartik'] = 0;
-    $core_extension['versions']['classy'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION];
-    $core_extension['versions']['bartik'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION];
+    $core_extension['versions']['classy'] = ['current' => \Drupal::VERSION];
+    $core_extension['versions']['bartik'] = ['current' => \Drupal::VERSION];
     ksort($core_extension['versions']);
     $sync->write('core.extension', $core_extension);
 
@@ -523,10 +523,10 @@ public function testExtensionValidation() {
     $core['theme']['does_not_exist'] = 0;
     // This module does exist but the version is wrong.
     $core['module']['ban'] = 0;
-    $core['versions']['ban'] = ['current' => '8.0.0-rc3', 'install' => '8.0.0-rc3', 'schema' => '8000'];
+    $core['versions']['ban'] = ['current' => '8.0.0-rc3', 'schema' => '8000'];
     // This theme does exist but the version is wrong.
     $core['theme']['seven'] = 0;
-    $core['versions']['seven'] = ['current' => '8.0.0-rc3', 'install' => '8.0.0-rc3'];
+    $core['versions']['seven'] = ['current' => '8.0.0-rc3'];
     $core['versions']['bartik']['current'] = '8.0.0-rc3';
     $core['versions']['text']['current'] = '8.0.0-rc3';
     $core['versions']['config_test']['schema'] = '8999';
diff --git a/core/modules/config/src/Tests/ConfigImporterTest.php b/core/modules/config/src/Tests/ConfigImporterTest.php
index 4dc2367..57af7d7 100644
--- a/core/modules/config/src/Tests/ConfigImporterTest.php
+++ b/core/modules/config/src/Tests/ConfigImporterTest.php
@@ -578,8 +578,8 @@ public function testUnmetDependency() {
     // Add a module and a theme that depend on uninstalled extensions.
     $extensions['module']['book'] = 0;
     $extensions['theme']['bartik'] = 0;
-    $extensions['versions']['book'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION];
-    $extensions['versions']['bartik'] = ['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION];
+    $extensions['versions']['book'] = ['current' => \Drupal::VERSION];
+    $extensions['versions']['bartik'] = ['current' => \Drupal::VERSION];
 
     $sync->write('core.extension', $extensions);
     try {
diff --git a/core/modules/simpletest/src/KernelTestBase.php b/core/modules/simpletest/src/KernelTestBase.php
index aecf0f9..848d5df 100644
--- a/core/modules/simpletest/src/KernelTestBase.php
+++ b/core/modules/simpletest/src/KernelTestBase.php
@@ -526,7 +526,6 @@ protected function enableModules(array $modules) {
       $version = \Drupal::service('info_parser')->parse($module_list[$module]->getPathname())['version'];
       $extensions['versions'][$module] = [
         'current' => $version,
-        'install' => $version,
         'schema' => (string) SCHEMA_UNINSTALLED,
       ];
     }
diff --git a/core/modules/simpletest/src/Tests/KernelTestBaseTest.php b/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
index 33fbeaa..240683d 100644
--- a/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
+++ b/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
@@ -342,7 +342,7 @@ public function testEnableModules() {
     $this->enableModules(['system', 'user']);
     $core = \Drupal::config('core.extension');
     $this->assertEqual(['entity_test' => 0, 'user' => 0, 'system' => 0], $core->get('module'));
-    $this->assertEqual(['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION, 'schema' => (string) SCHEMA_UNINSTALLED], $core->get('versions.user'));
+    $this->assertEqual(['current' => \Drupal::VERSION, 'schema' => (string) SCHEMA_UNINSTALLED], $core->get('versions.user'));
     $this->assertTrue(\Drupal::moduleHandler()->moduleExists('system'));
   }
 
diff --git a/core/modules/system/src/Tests/Update/VersionInfoUpdateTest.php b/core/modules/system/src/Tests/Update/VersionInfoUpdateTest.php
index 280cbe8..17132e4 100644
--- a/core/modules/system/src/Tests/Update/VersionInfoUpdateTest.php
+++ b/core/modules/system/src/Tests/Update/VersionInfoUpdateTest.php
@@ -31,31 +31,27 @@ protected function setDatabaseDumpFiles() {
   public function testSystemUpdate8015() {
     // Set a partial value to ensure that regardless everything is updated
     // correctly.
-    $this->config('core.extension')->set('versions.user.install', '8.0.0')->save();
+    $this->config('core.extension')->set('versions.user.current', '8.0.0')->save();
     $this->runUpdates();
 
     // Test that a module is added.
     $this->assertEqual([
       'current' => \Drupal::VERSION,
-      'install' => \Drupal::VERSION,
       'schema' => drupal_get_installed_schema_version('system'),
     ], $this->config('core.extension')->get('versions.system'));
     // Test that a profile is added.
     $this->assertEqual([
       'current' => \Drupal::VERSION,
-      'install' => \Drupal::VERSION,
       'schema' => drupal_get_installed_schema_version('standard'),
     ], $this->config('core.extension')->get('versions.standard'));
     // Test that a theme is added.
     $this->assertEqual([
       'current' => \Drupal::VERSION,
-      'install' => \Drupal::VERSION,
     ], $this->config('core.extension')->get('versions.bartik'));
 
     // Test that any existing version information is merged correctly.
     $this->assertEqual([
       'current' => \Drupal::VERSION,
-      'install' => '8.0.0',
       'schema' => drupal_get_installed_schema_version('user'),
     ], $this->config('core.extension')->get('versions.user'));
 
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 89577a2..3bcfa85 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -1907,9 +1907,6 @@ function system_update_8015() {
     $version = $info_parser->parse($extension->getPathname())['version'];
     $return = [
       'current' => $version,
-      // We can't know which version was present at install time so all we can
-      // do is use the current version.
-      'install' => $version,
     ];
     // Modules and profiles also stored the schema version.
     if ($extension->getType() === 'module' || $extension->getType() === 'profile') {
diff --git a/core/tests/Drupal/KernelTests/KernelTestBase.php b/core/tests/Drupal/KernelTests/KernelTestBase.php
index 7780ead..b9c633f 100644
--- a/core/tests/Drupal/KernelTests/KernelTestBase.php
+++ b/core/tests/Drupal/KernelTests/KernelTestBase.php
@@ -838,7 +838,6 @@ protected function enableModules(array $modules) {
       $version = \Drupal::service('info_parser')->parse($module_list[$module]->getPathname())['version'];
       $extension_config['versions'][$module] = [
         'current' => $version,
-        'install' => $version,
         'schema' => (string) SCHEMA_UNINSTALLED,
       ];
     }
diff --git a/core/tests/Drupal/KernelTests/KernelTestBaseTest.php b/core/tests/Drupal/KernelTests/KernelTestBaseTest.php
index 604711d..8585726 100644
--- a/core/tests/Drupal/KernelTests/KernelTestBaseTest.php
+++ b/core/tests/Drupal/KernelTests/KernelTestBaseTest.php
@@ -218,7 +218,7 @@ public function testEnableModules() {
     $this->enableModules(['system', 'user']);
     $core = \Drupal::config('core.extension');
     $this->assertEquals(['user' => 0, 'system' => 0], $core->get('module'));
-    $this->assertEquals(['current' => \Drupal::VERSION, 'install' => \Drupal::VERSION, 'schema' => (string) SCHEMA_UNINSTALLED], $core->get('versions.user'));
+    $this->assertEquals(['current' => \Drupal::VERSION, 'schema' => (string) SCHEMA_UNINSTALLED], $core->get('versions.user'));
     $this->assertTrue(\Drupal::moduleHandler()->moduleExists('system'));
   }