Recently purchased and installed Populous, everything worked fine, the game starts etc
However, the default resolution appears to be 640*480 which is a little bit small on my screen

I tried using the Graphic mode setup.exe provided in the same folder to change the various parameters but unfortunately, I get an error message when trying to either save the settings or launch the game from within the graphics mode setup.exe programme.

The exact error name is "Error: Game not installed"

The game is installed in c:\Programe Files\Gog.com\Populous (standard) and I have not made any modifications to the folders etc.

Any suggestions please?

[edit] Graphic mode setup.exe works fine if you launch it from the shortcut in the start menu. The problem arises if you try and launch it directly from inside the folder.

Solved now