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file Options.cfg in parent folder of a game
MAXUNITS change to 1000 - for me it's working (was 300 units)
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Ash_Housewares: The above posts seem to be the fix.

All I had to do was run the exe (shortcut in start menu) as administrator. I'm on windows 7.

I didn't need to run in compatibility mode, but if admin doesn't work, try it out.
Download the version that does not run on GOG and install and run as Administrator. This solved my problem without compatibility mode for windows 10 x64 bit