I wanted to make a TAS of Jazz Unleashed Demo, but use Jazz2TAS results in Access Violation. Can anyone tell me what I have to do to get Jazz2TAS to work?

I've never heard of this program before--it's not on J2O or anything--but you could try making an issue on its github page and see if you get a response.

I just realized there IS a way to make a TAS without Jazz2TAS.
It can be done in Angelscript, more or less like this:
void onPlayerInput(jjPLAYER@ p) {
if (jjGameTicks > 0 && jjGameTicks < 140) {
p.keyRun = true;
p.keyLeft = true; }
if (jjGameTicks > 70 && jjGameTicks < 140) {
p.keyJump = true; } }

Fatal error logs.

Error in Jazz 2 don't startup game.

HELP ME! and fix it.

FIX IT with me please. I attaching screenshot.

Try running jazz2.exe with some command line options like -windowed or -safe or -menu.