Hi Moroni;

  Yes ... You can have as many major versions of PB on one PC. For example, I have one of each major version of PB starting with PB 11.0 through Appeon PB 2019R2 on my test PC's. That includes PB2017 - with no issues.

  The only restriction are minor versions, like PB 2017 R2 vs R3 or 2019 R2 vs R3 that cannot coexist on the same PC.

Note that there is a major change coming to this restriction in the new PB 2019 R3 release that will allow multiple run-times of R3 and higher on the same PC.

Regards ... Chris

Adding to what Chris said, we have made some significant enhancements to versioning starting from PowerBuilder 2019 R3.

1. You can have multiple runtime versions co-exist on a machine, no matter it is minor version (e.g. revision) or bug fix (e.g. MR). 

2. You no longer need to log in and out of multiple versions of the PowerBuilder IDE.  In other words, you can work simultaneously in multiple IDEs.  

3. Although IDE versioning is same as before in that only major versions can co-exist on a machine, but now one single IDE can compile for multiple runtimes.  So perhaps there isn't even the need to have multiple versions of the IDE anymore.

But just keep in mind that the above changes applies to PowerBuilder 2019 R3 and newer only.  PowerBuilder 2019 R2 and older will still have same limitations as before.

In case you are interested, there was a good Webinar about the enhancements in 2019 R3 and the recording is available.