How can I roll back to CIS 5?

Obviously the problems I have with CIS 6 are only experienced by me and nobody else, so since CIS 5 worked flawlessly for me, I would like to use that again, where can I download it and how can I make sure I completely uninstall everything to do with CIS 6?

Filehorse has older versions:

http://www.filehorse.com/download-comodo-32/old-versions/

http://www.filehorse.com/download-comodo-64/old-versions/