I'm having the same issue with both SH3 and SH4 bought through GG. Went to install them on my new machine (which may or may not have been purchased to better enjoy Wolfpack
)
and neither one works due to the old Tages DRM stuff.
They also don't work on my old machine.
Also waiting on a reply from GG. I'll post if I hear anything.
Note: My activation keys did NOT work at Uplay.