In your folder where you installed the SoGE files; in the mod folder, there should be a text file called "EnabledMods.txt" within there you can dictate which mods should be launched (that is also a way you can save RAM by deactivating some of the faction you don't wish to use.)
When you're in there you can simply delete the mod launch order (though be sure to save a backup if you don't remember how the script line functions.)
You can also simply delete the txt-file if i remember correctly, but either way this should make sure the game runs in Vanilla.
Be sure you also read the "readme" file thoroughly if i forgot something.
Manifestorum
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