Does NMM even exist anymore? Vortex is the current mod manager - which is somehow worse than I recall NMM being. That said, manual modding until MO2 officially supports Oblivion is what I suggest.
It only begins correctly in 3rd person, but if you wait for the glowing mote to appear you can then zoom back into 1st person and it will continue to orbit you a provide light.
The Thunderstore’s biggest failing, in my opinion, is the lack of forums/comments. 9 times out of 10, the solution to a random modding issue can be found in some old comment. This is also why I HATE the recent shift to every modder having a personal Discord. Essentially unsearchable chaos.
The Nexus added “collections” - essentially mod lists directly from them - and to prevent said lists from breaking all the time, as different mods are updated at different rates, they made it so older versions of a mod couldn’t be just removed by the mod author so that a collection that uses that version could still get it.
God damn was that the dumbest drama in the history of internet drama. The Nexus was trying to do something VERY good for end users, and mildly inconvenient for some mod authors with control issues. Thankfully, very little of value was lost.
(Yes, I’m still a bit salty about being forced to the VASTLY inferior Thunderstore for 1% of my modding needs.)