I purchased the Hector series through the digital distributor Gamersgate.
Episode 1 and 2 install and play fine, however, when I run the Episode 3 installer, I get an error message saying that "the version of this file is not compatible with the version of Windows your're running. Check you computer's system information to see whether you need an x86 (32-bit) or x64 (64-bit) version of the program, and then contact the software publisher"
I am running Windows 7 64bit Professional.
I have tried to run the installer as an administrator as well as under various compatibility modes without any success.