You Can use Adobe Creative cloud desktop application to install Photoshop 2020 version 21.2.4 Its a better version than Photoshop 2018 version 19. Photoshop 2021 version 22 has many known issues.
When you install a new version of Photoshop you should not have the installer remove old versions of Photoshop. You do not know if the new version will work for you one when Adobe will break the new version next. You should always have at least one old working version of Photoshop installed for self defence.