Good for u :D

It worked ! I have to use the python app and I understand how to create, now on update.

You can open it in the app python, it is a script

The .py file is what u need my bad

I have looked up all over a space engine forum and the only downloadable file was a .py or txt file, sorry I don't understand this asteroid belt creator thing, and also I put dwarf planets were the belt should be in this pak

My bad sorry about that, you can also look on the discord Space engine server if u have that in the mod showcase channel and search for it there

but it's all on a .py or txt file it's the only downloadable file, the link your given is deleted

For the preset you can press zero, and then you have to enter the parentbody of the belt which is kepler 452, then you have to figure out the range of the belt from its inner and outer edge in au, along with how small to big the asteroids get, you also need to figure out the eccentricity and inclination (you can prob just skip those and press enter on all of them) and the refplane should be extrasolar and hopefully that works

I don't know how to use it

you could probably add a asteroid or kuiper belt to the system, use the asteroid belt creator from the SpaceEngine forum {LINK REMOVED}https://forum.spaceengine.org/viewtopic.php?f=3&t=546&p=33957#p33957