Ability to have more than one sub-version installed
Although I can install CC2017 without problem, if I want to use CC2019.0.2, and we're on 2019.0.3, it wants to UNINSTALL my current version.
Rule of thumb, if project files aren't interoperable (ie you have to convert them) then you should be able to keep multiple versions on your computer. I understand it's difficult to keep project files backwards compatible... fine... but let us then keep multiple versions of the software on the computer!
Antoine (Autokroma.com) commented
Did you try copy pasting the Program Files folder ?