There are 2 versions of SSE, one with, one without steam, de Vstep version is the one without i think and can be updated by their website.
The steam version can be updated inside the program it self if there is an update at steam.
From what i heard from other users this update corrupt some files within the steam version, uninstall everything and install again is also no option, something stays in the registry.
For those who know how to do this: uninstall, remove all registry entries from paradox, vstep shipsim.
The map into youre documents can stay there, now install again with no update, it should work again.
Rider