I have seen Blind Mind's JIT Compiler, but I was under the impression that it wasn't much supported any more? They don't seem to update it anymore, so I didn't think it was safe to use something that could become broken when a new version of AngleScript is released as the JIT Compiler would need to be kept up-to-date with every new version of AngelScript, right? It shows the last update to the JIT Compiler was for AngelScript v2.27, which is over a year old now. Not to mention if there was a bug, and nobody is around to fix it, then it kind of leaves you on your own. I consider myself a seasoned C++ programmer, but unfortunately not good enough to try and fix a bug in the JIT Compiler if one existed, or to try and keep it up-to-date with AngleScript if I was to use it.
There are relatively few changes to Angelscript that require us to update the JIT. Most changes affect how the bytecode is assembled, rather than what a specific bytecode does. When new bytecodes are added, the JIT also falls back to Angelscript execution so it can continue to work. Most bytecode changes are relatively simple and I can easily keep it up to date.
Due to this, the last updated version is just a guarantee of what version works, not an indicator that other versions don't work.