[{HVY-E}Jinxx]

I did not delete anything, uninstalled il2 which had HSFX and UP, reinstalled, and patched to 4.10. Could the mods have stayed, I thought uninstalling would have deleted them.

Thanks Keegc.

Yes, that's almost certainly the reason your game is crashing.

You can't install it over an old copy.
You have to completely uninstall, delete the old directory and then install the new version of the game.
The reason this has to be done is due to the old .class files. A lot of them no longer work with 4.10m.

S!