First, you need to download the `unsup_setup` script compatible with your system.
If you're on Windows, use [this link](https://www.coastalcommits.com/GalacticFactory/GalacticFactory/releases/download/Pre-Release/unsup_setup.ps1).
If you're on Linux or MacOS, use [this link](https://www.coastalcommits.com/GalacticFactory/GalacticFactory/releases/download/Pre-Release/unsup_setup.sh).
Now, Create a new 1.20.1 Forge instance, and go to your settings page.
Then, move the `unsup_setup` file to your instance's `.minecraft` folder and run it. You can click the `Folder` button to open your instance's folder.
Scroll down in your settings page until you find the `Java` category. Click the `Override global java arguments` button, then put the following argument into your `Java arguments` field.
```bash
-javaagent:unsup.jar
```
Launch the game, and the modpack will automatically download itself and update on launch.
