I installed Zeus+Posiden on my laptop but I can't seem to get it to start. I get an error message that says game was expecting certain tags on the font and interface files but has none. I don't see any font or interface files at all so I'm confused. I've tried changing some of the compatibility settings as well to no avail. Hoping someone can help. Thanks!

The solution, thanks very much to excellent GOG support team, is to right click on the setup application and run it as an administrator. The game runs perfectly now.