After installing the plug-in there is a Latest Update Date entry in Settings column. If clicked, you get an error page with the message: You do not have sufficient permissions to access this page.
The Settings can be accessed by going to the Installed Plugins and selecting settings, which opens a Latest Update Date Options page, where the plug-in can be activated and the date format chosen. However, the format cannot be changed and will only display the j-n-Y format even if left empty. Checking the plug-in PHP file, this seems to be the only choice, although it can be changed to any Codex date format and the plug-in will work.