Installation of Atlas did not work ... Wrong PS version?

Hi …
Hope this is the right group. I can’t seem to be able to locate any email address or other ways of communicating with the customer support.
So I think I’ll just leave a post here in this forum, and hope for the best.

I just purchased and downloaded Atlas plugin for Photoshop, but nothing shows up in the Window/Extensions menu. Not even after several restarts ans reinstallations.
I have a rather old version of PS, namely PS5.5 from the CS5 package.
Could it be that I should downloaded an earlier version of Atlas? I can’t find any, though.
Is there another solution to this?


Assuming this is the item?

It says the minimum version is 2015, so check the item documentation which will explain installation, and if no solution then reach out to the author or