Modding on the Spectrum
These are the files in question:
ccBGSFO4044-HellfirePowerArmor.esl
ccBGSFO4046-TesCan - Main.ba2
ccBGSFO4046-TesCan - Textures.ba2
ccBGSFO4046-TesCan.esl
ccBGSFO4096-AS_Enclave - Main.ba2
ccBGSFO4096-AS_Enclave - Textures.ba2
ccBGSFO4096-AS_Enclave.esl
ccBGSFO4110-WS_Enclave - Main.ba2
ccBGSFO4110-WS_Enclave - Textures.ba2
ccBGSFO4110-WS_Enclave.esl
ccBGSFO4115-X02 - Main.ba2
ccBGSFO4115-X02 - Textures.ba2
ccBGSFO4115-X02.esl
ccBGSFO4116-HeavyFlamer - Main.ba2
ccBGSFO4116-HeavyFlamer - Textures.ba2
ccBGSFO4116-HeavyFlamer.esl
ccFSVFO4007-Halloween - Main.ba2
ccFSVFO4007-Halloween - Textures.ba2
ccFSVFO4007-Halloween.esl
ccOTMFO4001-Remnants - Main.ba2
ccOTMFO4001-Remnants - Textures.ba2
ccOTMFO4001-Remnants.esl
ccSBJFO4003-Grenade - Main.ba2
ccSBJFO4003-Grenade - Textures.ba2
ccSBJFO4003-Grenade.esl
Case 1: If you prevented the game from updating before the Next Gen Update happened
There are two different ways.
Way 1:
Download the new Creation Club content with the Steam Depot method.
Way 2:
Or rename your modded Fallout 4 install, remove the read-only flag from the appmanifest_377160.acf file (otherwise the game won't update) and update the game. Copy the new and returning Creation Club content to your modded Fallout 4 install, delete the updated install (or make a backup of it and move it elsewhere) and rename the folder of your modded Fallout 4 install to its previous name.
Case 2: If you have updated the game already
Downgrade your game. There are different ways to downgrade but I think the easiest way is using the Fallout 4 Downgrader tool. Keep the files which I listed above in your Data folder.
Part 2: How to make Fallout 4 load the Next Gen Update Creation Club content without crashing
The game crashes because the corresponding ba2 archives have been changed to the Starfield format which the previous version of the game can't read. This makes Fallout 4 crash.
There's a workaround using the Backported Archive2 Support System. It requires Fallout 4 Script Extender (you need the old version from October 2022 which is for the non-Next Gen version of the game) and Address Library for F4SE Plugins (the 1.10.163.0 version).
Installation of Fallout 4 Script Extender: Extract the content of the archive to the folder where your Fallout4.exe is located.
Installation of Address Library for F4SE Plugins: Put the content of the archive of the Address Library into your Data folder.
Installation of Backported Archive2 Support System: Put the content of the archive of the Backported Archive2 Support System in the folder where your Fallout4.exe is located (or open the Data folder inside the archive and move the content to the Data folder of your Fallout 4 install).
Run your game by clicking on the f4se_loader.exe.
Part 3 (optional): Prevent Steam from updating your game so you can stay on the previous version of the game as long as you like
and1.) Set the Steam client to update the game only on launch, do not allow background updates, and set a time window for updates during a time your computer is off. Also, never start the game again through Steam (do not press the PLAY button), but start it with tools like the F4SE launcher.
More methods can be found here.2.) Set the manifest file to read-only. The file can usually be found here: C:\Program Files (x86)\Steam\steamapps\appmanifest_377160.acf. In case you have installed the game elsewhere will you need to search there, i.e. another drive, for the same file. Open the properties of the file and click on the read-only check box and thereby mark the file as read-only. This stops Steam from updating the game. Do not verify the game files after you have done this, or it will unmark the file again. Same with the Steam client updating itself, check it is still unmarked.
