Get the whole CD onto a USB Drive.
Move the Contents into a folder C:\ProcommInstallCD
Create Folder C:\Procomm Install Location
(may need to modify some security settings, but don't unless it doesn't work)
Start Install Using Setup. (May need to do Administrator)
Select the folder C:\Procomm Install Location as the folder to install to.
That should be about it.
May need to do a few "Compatibility" things with the shortcut.
The reason you need to create your own folder, is due to the security structure of "Program Files". After all, this software was Windows 98 circa? or earlier...
Also ~ Sweet tip.
If you have "start as administrator" on the Procomm Plus Link, this won't allow people to control it when you share using MS Teams/Webex Sharing.

~ Running with regular privileges work.
Found an old thread also, but that was on Windows 7 ~