Photoshop 20.0.10 version it´s becoming too slow to open

Hello,

I have PS 20.0.10 version (I think it´s the only one I can run in my old Windows 7). It was working perfectly so far, but I have been noticing this past week that is becoming too slow to open (sometimes it takes almost 10 minutes to open the program completely). I already set up my Preferences to allow PS more space to run, though I have just 4GB of RAM... I don´t know what else to do, because the other option (compatible) to update is 21.2.6, and the new version is incompatible to my computer and my old Windows...I already try to uninstall 20.0.10 and install 21.2.6, but it didn´t work (simply don´t open).

I think each update Adobe gives to each version is making the version "bigger" and kind of slow to computer...Or they are trying to force to update to the new version?