[otrs] how to uninstall otrs?

hi all i have installed otrs - via compiling and building and configuring. now otrs resides in /opt/otrs any idea how to uninstall everything? i am trying to upgrade my plesk on my server and get this error in the end: Check for components installation status Reading system installed packages...done. Download file plesk-8.0.0-fc2-i386.hdr.gz: 48%..100% done Download file plesk-8.0.0-fc2-i386.hdr.gz: 26%..100% done Resolve components ERROR: Impossible do installation while package otrs-2.0.4-01.i386 is installed in system thanks! -david