How to re-install GrimeFighters?

I had a lot of changes to my computer and no longer have GrimeFighter and would like to re-install it.
How do I do that?
Thank you ~ Kelly

Control panel > software > avast > change
Please use the search option before posting.
This has been explained many times already.

It is always a good practice if you want to use software, you learn how to use it, what options/settings it offers etc.