Hmm... What do I put for the version? And is there a reason why it might be crashing? Android, did all the instructions.
What does "put for the version" mean? You just download it, don't muck around with the filename or whatever that means.
Without further context, best guesses for crashing are either JoiPlay being finicky as usual, or whatever modification(s) you're doing with this "put for the version".
If you indeed did all the instructions, only possibility for the error is JoiPlay being finicky. The vast majority of people have had no issue with the latest version, but a few do. If so, contact JoiPlay, I know they have a Discord but can't see it myself since I don't have an invite link.