The possibility of having multiple versions of Premiere Pro CC.

I recently bought the HPZ440 Workstation and was super excited about using it so I didn't really think much before updating all the Apps via creative cloud.

I have been using my laptop and it is incompatible with the latest version of premiere pro cc 2019 but the workstation had no problems.

However, the situation is that most project files were worked on with the 2018 version. When I opened them on the 2019 version it converted them of course but I can't open the project files with the 2018 version anymore.

I still want to use my laptop when I am mobile so Is it possible to re-install the previous version and if it is, can I still retain the latest version as well?