MultiMC

1. Open MultiMC

2. Right-click on the FO instance

3. Click on Minecraft Folder

4. If you want to reset mod options, delete the config folder

5. If you want to reset vanilla options, delete the options.txt file

6. Download your version from the FO versions on Modrinth. A file should be downloaded

7. Rename the downloaded file to pack.zip

8. Extract the zip file

9. In the extracted folder, open the overrides folder

10. Move the configs folder from step 9 to the folder you opened in step 3