A Fabric Minecraft client containing quality of life mods and general improvements
Go to GitHub releases and download the appropriate file
Once installed, launch the minecraft launcher and click on the Installations tab. Press new, name it Limatus or whatever you want. The game directory must be C:\Users\username\AppData\Roaming\.minecraft/Limatus-files on Windows or ~/.minecraft/Limatus-files on Linux. Then you can launch Limatus
Download Technic Launcher and look up Limatus under ModPacks. Install and play