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For steam users, who have are struggling with manually updating the app manifest the following workaround works too: 1: backup your entire Fallout4 folder from \steamapps\common\Fallout 4 2: let steam do the update 3: set the \steamapps\appmanifest_377160.acf file to read-only 4: delete the whole Fallout 4 folder from \steamapps\common\Fallout 4 5: restore your backup (you did make a backup in step 1 right?) 6: launch vortex, it will tell you that mod deployment is needed, do so, but choose "Use newer files" 7: welcome to the caveman club and have fun playing your old, outdated, un-updated, non-nextGen version of Fallout4