Prism Launcher
Open the Prism Launcher
Select the FO instance
Click on Edit
Click on Mods
Click on Download mods
Find the mod or mods you want to add
Click on Select mod for download
Click on Review and confirm. A confirmation window should appear
Click on OK
Once installed, launch the instance. Minecraft should open up
If you can see the newly installed content in the Mod Menu, you're done!
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