OK, so we have a fresh install of Win7 here, just like to start out with that. Also, I have reinstalled FL and FLMM multiple times by now to get this to work.
It started off that the auto-updater failed to do something because it said a file was already in use...
And of course it doesn't launch a second time, so I was stuck -reinstall-
etc. etc.
For a while, the mod just refused to activate in FLMM.
Now, I have FL installed, I have FLMM installed, and I have the mod installed and activated. But when I go into FL, guess what? It's vanilla FL as if FLMM and the mod weren't installed and active.