Modrinth App
You should ALWAYS make backups before updating.
As with any other piece of software, updates may go wrong for many reasons, including but not limited to: the launcher, the hardware, your custom configuration, the mods you added... and, rarely, FO as well.
Open the Modrinth App
Click on the Library section
Select the existing Fabulously Optimized instance
Click on the Update modpack button on the top-right
If you do not want the latest version, select the version you want from the dropdown
Click on the two-arrows button. FO should get updated
Once updated, launch Fabulously Optimized. Minecraft should open up
If you can see the newly installed version in the bottom-right corner, you're done!
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