I got it running somewhat. Virtual and Editor both work. I copied an old ProScan program off my laptop to a thumb drive. Opened it up on my PC. Changed Scanner type and ComPort for each instance (3). The problem is the version I copied is 20.7. I decline the update when prompted and it works. If I update to 23.4 it only gives me the editor and not Virtual.
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I think you are installing ProScan versions in different folders so the options(including window state, sizes, and locations) are not the same. It could have been the main window was minimized to the Taskbar or Notification Area. If you had sent me an email initially, I would have asked for the config file and see exactly where the problem is or was.
{EDIT}
I think when you copied an older version, the config (ProScan.cfg) file copied too so the options will be different. So If before, the window state is normal and the last version, it is minimized, coping the config file will make it normal.