The SportSoftware V11 is perfectly prepared for Win8. Since the SportSoftware applications are desktop office applications, it is best to have them running on the Win8 desktop.
For the older SportSoftware V10, there is the same restriction which you have since Windows Vista and Win7. Since the V10 has its event data saved in subfolders of the program folder, you have to install it into a private folder instead of the default C:\programs\… folder.
So Win8 is one more reason to update to V11 for those who did not do so yet…