This extension no more works. I installed Extension:StubManager as a dependency, and after that many PHP errors appears when a page contains the wikisyntax {{imagelink:Image.png}}:
- line 130 in ImageLink.body.php during the construction of the object: PHP Fatal error: Call to a member function addMessages() on a non-object -- initialisation of the messages changed since, and this syntax is probably called too early (I commented it to test further).
- line 231 in ImageLink.body.php: Class 'Image' not found: the image management was generalised and refactored around MediaWiki 1.11 and Image class was mainly renamed to File and the method newFromName was deleted.
For these reasons, I change the status of this extension to unmaintained. Moreover it is claimed to work until MW 1.17, which is unsupported since two years.
As a side note the main feature of this extension (create a custom link or no link on an image) is a core feature since MW 1.14 as written on the extension page.