Hello guys. In the meantime, thank you all, you are kind. I'll answer you one by one.
Maroon: The idea of moving to Unreal is just that. If I have to restart with a new program, I might as well do it with a powerful one and xhe will update continuously, thus not losing its ability to run on programs as it happened to me.
Emor: My friend, it's good to hear from you. We worked well together. The problem is twofold, actually. In addition to not being able to use custom Python (which is a detail, in the end I can give it up and use the standard ones) but the toughest problem is precisely that in the phase of creating events, such as animations, puzzles or other events, it no longer appears the bar where I entered the name of the variables of the SDL file. Variables are vital to any age. Without those not only are the progress within the age not saved, but multiple exploration clearly suffers from it (it was in fact one of the first problems we faced at the beginning as developers).
So by not allowing me to match an event to a specific SDL Variable, it becomes useless. I also tried to rewrite the files, but at that point it didn't even read them to me (a complication arose that didn't exist before in MAX).
Dulcamara: a writer I greatly admire for big worlds. The decision to change the engine pushes me to avoid meeting the same fate a second time. That's why I chose Unreal: powerful, complete and already used for Obduction and Firmament. So I already know that it can be used to create something that respects the style of our beloved MYST. Only now I have to do it all over again (and it's going to take a long time to learn). If I have to do it, I might as well do it once and for all. I haven't thrown in the towel yet, but I admit that after months of testing I don't know what to do anymore. I fear that the engine is too old for MAX, and those who work in MAX are unlikely to be comfortable with Blender (and vice versa, as the great Andy Legate once said).
That said, if anyone has any ideas, I'm here to listen. For now unfortunately the age of time is stuck in its first room and even without lights.
Thanks. Love you all.