I try to update FOG II and continually get an error message: Contact Slitherine. Maddening. What to do???

I have FOG II and 4 of the modules. I just bought the Wolves module and find the FOG II needs an update for Wolves to play. I always get a update notice on starting FOG II but the update sequence never has worked. I tried again today to update it: FOG II update 1.5.23exe from update 3. Message is Un...