This is strange... i know this is a8 key but when i install 7.86(full), key8.dta comes automatically in GStudio7 folder. Maybe Jcl created a new setup file and corrected it. i will download new setup file later.
Edit:Okay,
Firstly; "key8s.dta" name is true. "key8.dta" is wrong. i was wrong, sorry about that.
Secondly; there is no new setup file. i have download it from donwload page. "key8s.dta" is still coming. if i don't delete this file, enigne runs like free version. anyway it seems this is not about your problem. Have a nice day.