Install
Works with Drupal: 8.xUsing Composer to manage Drupal site dependencies
Alternative installation files
Release notes
The 1.x branch is not supported
It will not receive any further fixes and will not ever support Drupal 9. It will be marked as unsupported on Drupal.org when Drupal 8 becomes unsupported (currently planned: November 2021).
You are recommended to upgrade to 2.x which fixes many bugs, including some for security and data corruption. The release note has a full list of changes and links to some change records. Unless you have heavily customised the module by overriding main classes then migration should be easy.
This release does not change any code. It has been created to make sure that people are aware of the above.