I had no SKSE.ini that I could find.
I renamed another ini SKSE.ini
I put these lines into the blank ini
[General]
ClearInvalidRegistrations=1
[Display]
iTintTextureResolution=2048
[Memory]
defaultHeapInitialAllocMB=1024
scrapHeapSizeMB=256
I put the ini in Steam/steamapps/common/Skyrim/Data
And some1 on these forums said I could test it by doing this: add EnableDiagnostics=1 Add that, deactivate one of your existing mods and then try to start the game. If the INI is being read you should get a warning about missing content but now it will include the name of the mod you deactivated.
I was told I was missing content but the name of the mod I deactivated was not listed?
I am useing NMM not MO