ATLauncher

ATLauncher is a launcher for Minecraft which integrates multiple different modpacks to allow you to download and install modpacks easily and quickly.

ATLauncher has a few nice features including:

• Allows quick and easy install of modpacks, no more messing around trying to install mods
• A range of different packs, and more being added all the time
• Multiple instances. Install a pack as many times as you like without messing up a previous install
• Multiple accounts allow you to login as different users from the one install
• Private instances. This allows you to only install instances under your account so people can't mess up your worlds
• 1 click backup of your saves
• Easy server creation from within the Launcher
• Install packs from CurseForge and FTB
• Mod management for instances, including auto download and installation of mods, maps and resource packs from CurseForge and Modrinth
• Support for both Mojang and Microsoft accounts
• More features always being added

Below is the steps to run this flatpak in a custom directory

1. Open Flatseal
2. Select ATLauncher on the left
3. Scroll down to "Filesystem", "Other files"
4. Add a new entry via the icon with a "folder" and "plus" sign
5. Input the path you want to let ATLauncher run in. IE `/home/name/Games/ATLauncher`
6. Scroll down to "Environment", "Variables"
7. Click the "plus" sign to add a new entry
8. Write down an enviroment variable, IE `CUSTOM_DIR=/home/name/Games/ATLauncher`
9. Run ATLauncher
10. Notice that ATLauncher is now working using CUSTOM_DIR