I just ignored the whole key issue and 1.0.0.5 seemed to execute just fine.
I had uninstalled 1.0.0.4 already and was surprised to see a key character string in the box, noticed that it was different than the one listed to the left, and also noticed that the text to the left referenced Beta 1.0.0.4. That all seemed too complicated for Saturday night, so I just hit go and went in.