SimplyTest.me

Mike, can you try installing it locally? It's not clear to me how this can happen - visitor_actions module has the required hook_schema implementation in its .install file for creating the db table so I really don't understand how this error can occur..?

The error log:

.....

No release history was found for the requested project [warning]
(variable_store).
Could not download requested project(s). [error]

......

The following extensions will be enabled: visitor_actions, ctools
Do you really want to continue? (y/n): y
WD php: PDOException: SQLSTATE[42000]: Syntax error or access [error]
violation: 1071 Specified key was too long; max key length is 1000
bytes: CREATE TABLE {visitor_actions_actions} (
`id` INT NOT NULL auto_increment COMMENT 'The internal identifier for
any action.',
`machine_name` VARCHAR(255) NOT NULL COMMENT 'The machine-readable
name of the action.',
`label` VARCHAR(255) NOT NULL DEFAULT 'unlabeled' COMMENT 'The label
of the action.',
`plugin` VARCHAR(255) NOT NULL COMMENT 'The plugin defining this
action.',
`event` VARCHAR(255) NOT NULL COMMENT 'The actual event for this
action, e.g. click.',
`identifier` VARCHAR(255) NOT NULL DEFAULT '' COMMENT 'A string that
is used to identify the thing being acted on.',
......
PRIMARY KEY (`id`),
UNIQUE KEY `machine_name` (`machine_name`),
INDEX `plugin_identifier` (`plugin`, `identifier`)
) ENGINE = InnoDB DEFAULT CHARACTER SET utf8; Array
(
)

@patrickd is it clear to you from this what the actual problem is with the schema definition? I'm having trouble inferring which key it's referring to. Here's the schema:
http://drupalcode.org/project/visitor_actions.git/blob/refs/heads/7.x-1....

I guess it's INDEX `plugin_identifier` (`plugin`, `identifier`) but I'm not sure either..

you can create a patch that removes the index post it here, apply & test it on simplytest.me

Yeah, it's that index. Two columns with 255 characters I think is too long for some default MySQL setups. I just removed it and it installed fine.