I have been unable to install Power InRoads Ss4 on a PC with Power InRoads Ss2. This Windows 7 Professional - 64 Bit PC had Power InRoads Ss3 installed with Power InRoads Ss2 and there were no issues.
After my initial installation attempt, where it complained about prior versions preventing the installation, I uninstalled Power InRoads Ss3 and tried again.
This resulted in the same message about prior versions preventing the installation. I cannot remove Power InRoads Ss2 due to the fact that all clients are still using InRoads Ss2 and require delivery of Ss2 compatible files - including IRD files.
What can I do to run both the Ss2 and Ss4 versions on my PC?
One nice thing I found with the Power Products was that there seemed to be less issues with multiple versions that there are where MicroStation was the CADD Platform.