I would follow this guide and note a few things here.

1. The default download path is your windows drive. To change this you need to type -dir “folders address” (with quotation marks) AFTER the other commands

2. Within your normal game directory make a folder for your current and old patch. Put the current one you are using in the main folder and the other in the sub folder.

3. Backup your save games if you care.

4. Multiplayer has not been tested for downpatching

5. The proper depot id, game id, and manifest id is;

6. App ID 1144200

7. Depot 1144201

8. Manifest 2731037361483154546

9. This is the earliest patch you can go with dlc/UE5 downpatching to anything before the unreal engine 5 update is not allowed and WILL result in run rejection.