I think it might also be useful to add a notice that you will get an error message when loading fonts if there is no Fonts subdirectory. One that looks something like this:
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Yeah, the script lacks error handling in some places. I'll add a meaningful error message to the script on the next update round.
Btw, you can also define a custom font directory with :ExRelease . -fontDir X:\Font\Dir
or if you are already in your working directory:ExRelease . -fontDir .
i could even make "." the default -dir, so you could omit the first dot
Edit: updated ExRelease with improved error handling for some common cases, including the one you posted. I decided against the "use current directory as default"-thing because it'll probably cause confusion among some users.