Never in 40+ years of working in computing have I seen a worse piece of software than GrimeFighter. on the market.
So you never have seen Windows? ;D
If I run it from Avast in Windows it asks me to reboot the system and then says I need to be attached to the internet, which I can't do from outside windows.
Use a wired connection and it should work.
If I run it from the standalone GrimeFighter in Windows with the Internet running
GrimeFighter needs to boot into its own Linux environment in order to work.

If you want a refund, you need to sub,it a ticket requesting it.
https://support.avast.com

$150 an hour ? Sjees, I only charge them $25

ps:
Unless you like to receive a lot of spam, it is not a smart thing to post your email address on a public webboard.