The enlargeIt Plugin is not part of coppermine's core, but a user contribution. It changes the core functionality. You lose some of the features coppermine comes with. I already told you so on your similar thread:
Quote from: Joachim Müller on August 01, 2009, 12:11:39 AM
As the enlargeIt plugin stops users from accessing displayimage.php, so all plugins or mods that have an impact on displayimage.php can no longer be accessed, so the short answer is: no, you can't use both. Actually, you can of course in terms of compatibility, but nobody will notice.
Please don't ask yet another question about the enlargeIt plugin if it comes to features you lose. The answer remains the same: don't use the plugin if you can't live with the fact that it removes the ability of visitors to go to displayimage.php.