I mean, it's not a trojan. You can try this alternate download instead if you'd rather, though you'll still have to run an application (plusifier.exe) one time, to convince your Jazz2.exe to read from plus.dll.

JJ2+ rewrites a significant part of the code processing controller inputs. The original JJ2 code has no conception of dpads existing, and the JJ2+ rewrite does. It has absolutely no connection to autohotkey.