I cant download Aristois!
I download aristois(jar) on https://aristois.net/download
but it looks like this↓（1st picture)
And I cant find this version in the launcher (2nd picture)
I can't tell what launcher that is from, but it's not supported. Make sure you fully close the game and launcher when installing or it cannot properly update the files. You may also need to create a new release for Aristois