Hello sando and welcome to the ArtRage forums
Well, I would hesitate to contradict AR’s developers if they say AR6 is the minimum requirement to run on an M3 based Mac.
Where did the copies of AR Lite and AR5 Demo that you say you have managed to successfully install come from?
The only current publicly downloadable Lite and Demo versions of AR that I’m aware of are both versions of AR6.
But if you really have managed to install any version of AR5 and got it to run, I would suggest you contact Tech Support again with the details, and possibly send them copies of the installers you have successfully used.