Comment by unleaded
Roblox preservation has pretty much been a solved problem since around 2016. The clients all have built-in network servers and many people have built launchers to let you easily play a server with your friends. A lot of the knowledge is unfortunately gatekeeped inside Discord communities of crazy people but there are a few "good names" out there (Novetus is the big one)
Thanks for that info.
To be honest this librebox project looks kinda fishy to me. Seems like the author never used version control before. They put everything into one commit [1] and are making changes to the repo using the Github web UI. I wish the dev the best of luck but I wouldn't be surprised if this project gets abandoned in a few months
[1] https://github.com/librebox-devs/librebox-demo/commit/e70ea3...