Sorry I'm at a loss now, that was my last shot really.

I had a bit of a search but didn't find much beyond re-installing Excel.

That was for add-ins in general, not this specific one.

I know you want to use this tool because you want to look at converting 2003 code to 2010, but are you sure
you actually need to convert anything?

I've tried this tool in the past and, to me anyway, some of the comments were a bit vague, even unhelpful.

For example saying line of code was deprecated but not saying which particular part of the code.

What 2003 code have you had fail at home when you tried it on 2010?