This downgrade is not download and run distribution, monsters and spells are probably not 100% correct. You are welcome to submit a pull request though.
This downgrade is up to Dec 21, 2021, commit: https://github.com/otland/forgottenserver/commit/17bf638815fa7c04d5b723baa8e0bfbdaad341f2
Pull requests are welcome. Just make sure you are using english language.
If you find any bug and believe it should be fixed, submit an issue in issues section, just please follow the issue template.