Two suggestions:

1) is the new one trying to install to a different directory? Maybe you have both installed and it's finding the old one first in your path.

2) If you have emphatic running (doesn't have to be active, just listed as an option in the Hijack menu, you can't overwrite the file with the new version. Select it from Hijack so it's active, then press the knob again to get emphatic's menu and select Quit. Now try uploading again.