ParodiusX

My bad. I put the {$RANGECHECKS OFF} directive into wrong unit. I’m really sorry. Thank you very much for your help.

Thank you for your answer but unfortunately that’s not the problem.

For licensing my software, I use the PKVS described here: https://www.brandonstaggs.com/2007/07/26/implementing-a-partial-serial-number-verification-system-in-delphi/ In VCL works fine but I have problems with it in Firemonkey. When I call PKV_GetKeyByte I get error message 'Range check error'. function PKV_GetKeyByte(const Seed : Int64; a, b, c : Byte) : Byte; begin a := a mod 25; b := b mod 3; if a mod 2 = 0 then result := ((Seed shr a) and $000000FF) xor ((Seed shr b) or c) else result := ((Seed shr a) and $000000FF) xor ((Seed shr b) and c); end; Any help? Thank you very much.