I used to think installing 2 different versions of Primavera P6 Professional on the same PC was impossible.

Well, impossible OR really, really difficult.

I used to have a complicated VirtualBox setup with a huge virtual machine that would crawl along with delayed mouse movements just so I could run an older version of Primavera P6 on my PC.

Of course, I would install the latest version directly on my local machine.

But now with the release of Primavera P6 Professional v18.5, you are able to install the latest version of Primavera P6 (18.5+) along with any existing version you might already have installed on your local machine.