Doesn't matter what version you have, the poster can only be ran on one computer at a time. ProjectMaker can be opened on more than one, but not the poster
Q: What does it mean «Count of computers» and how does it differ from «Running copies»?
A: Although you are authorized to install the Standard and Professional versions of the program on multiple computers, the program can only be executed on one computer at a time. ProjectMaker is an exception you can run it on all machines simultaneously.