This is a fork of Advanced Rocketry.
You can download the new mod from curseforge: https://www.curseforge.com/minecraft/mc-mods/advanced-rocketry-2
Check out Towards Rocket Science - the modpack all about Advanced Rocketry and Immersive Engineering: https://www.curseforge.com/minecraft/modpacks/towardsrocketscience (Quests, Tech, Beginner-friendly)
original github repo: https://github.com/Advanced-Rocketry/AdvancedRocketry
old documentation: http://arwiki.dmodoomsirius.me/
You can see all bugfixes / improvements in the commit history