If you want to install another version you have to go to this page: Releases - Topaz Community
Then select the version you want to download, e.g. 2.0.4: Topaz Photo AI v2.0.4
And on that page see the first post of the thread (by the developers).
It usually looks something like this:
There you can download the appropriate version and then install it locally on your machine. You might have to uninstall the new version first.
Good luck!
