Hello Adam,
We also check your PCs compatibility to run GrimeFighter since it boots into Linux. It means that some PCs cannot run GrimeFighter. When we check the hardware configuration on your PC we decide whether or not your PC can the product and if not we don't display it.
We have a release planned for mid-Feb which should improve that quite a bit so it might appear some time after that. Later this year we expect even more improvements to this (May/June)
Hope this helps.
Davidek