I just installed the G.E.C.K. and downloaded the updater. I tried to update to 1.5 and it seems to have failed.. I have the Steam downloaded version, so my game files are in the steamapps directory. I cannot run the GECK without getting an error stating "File FalloutNV.esm is a higher version than thise EXE can load". It seems that I cannot update the GECK for some reason. Is anyone else having this issue?

That's only for the FO3 GECK. There's no update for the FNV GECK (at this time)