EUP, which stands for Emergency Uniforms Pack, is an add-on DLC-style mod. It adds new police uniforms as an "add-on" file rather than replacing the game's core files. The pack focuses on the law enforcement outfits you see in the game.
(critical for the patched version):
If a mistake occurs during uninstallation, restoring this folder avoids a lengthy re-download of the game. Step 2: Removing EUP via OpenIV how to uninstall eup law and order patched