I just recently installed Oblivion using GOG Galaxy.

So far I have the Unofficial Oblivion Patch, Unofficial DLC Patch and Unofficial Shivering Isles patch extracted in the main Oblivion Folder, which for me is in E:\GalaxyClient\Games\Oblivion.

However when I load the game it doesn't have any options in the Data Files settings for these mods/patches. They are just not there. They don't even appear in Oblivion Mod Manager or Wrye Bash.

I have tried doing BSA Redirection in Oblivion Mod Manager and Wrye Bash but that hasn't worked either.

Any clue what is going on?

EDIT:

The game is crashing immediately after I click start game in the Oblivion launcher too.

Please help, I have no idea what the issues are!

Tipp: Most mods come with a readme file. Read it!

The main mod folder for Oblivion is Obivion\Data. This is the folder where Oblivion searches for mods when you click "Data Files" in the main menu.

I'm not sure what files you downloaded, but the readme files of the Unofficial Oblivion / Shivering Isles / DLC Patches I have all say "install to Oblivion\Data".

Edit: Just saw a UOP readme saying "Install to Oblivion" - this is wrong! All files having an extension of ESP or ESM must be in Oblivion\Data.