control panel > software > avast > change > put a checkmark in front of Grimefighter.

or simply download the stand-alone version from one of the many websites that are offering it.
This is just one of them:
http://www.getavast.net/downloads/grimefighter

Worst support?
How/where have you tried to get support?

No telephone support?
Ever heard about a phonebook ? :wink: