PM can not open

[aleksa77]

I instaled on 3. PC Zennoposter . But i try open PM on this 3. PC, but can not, allways get pop up with message:

You can run only maximal 1 instances of this software at the same time.

This is version 5.7.5.3

 

[rostonix]

Did you try to reboot PC? Will it help?
If no, run Diagnostic.exe and attach report please