Never got into msstyles...heard not good things from a friend about treatment of customers
I think you may be referring to TGTSoft and its flagship app, StyleXP here... they were operational one day and gone the next, without as much as a by your leave or thank you to their loyal customer, and worst of all, NO notice or warning.
I read/heard of cases where people requiring support received no replies to emails they had sent, not even an automated: "Sorry but we've gone out of business" , to explain the absence/lack of support.
I have a copy of StyleXP I can no longer use after reinstalling my OS (need a new installation No). Oh well, it's no great loss, I've since discovered WindowBlinds and find it to be the superior UI customisation tool all-round. Besides, WB doesn't hack system files so is the safer option anyway.