How do I downgrade PS to 2017 after updating CC to 2018

I've recently updated PS CC (NOT 2017, yes, I know a stupid move) to 2018, and thus the previous versions (in my case, PS 2017) were removed from Creative Cloud and I can no longer downgrade back to 2017, which I want to do because I wasn't aware that Adobe's software testing team sucked and 2018 version is going as slow as Modern Warfare Remastered on a pSVita if such a thing was possible. Does anyone know how I can downgrade to 2017 again even after such a slip-up?

I have Windows 10, and the only other Adobe products I have are Acrobat, Acrobat DC, Premiere Pro CC including previous version 2017. My computer is a dual-core with 500 Gig of internal memory and 10561 MB of RAM. I've heard a lot of other people have this issue and I don't think my hardware is the problem.