A note of caution..
WOT gives the site (to download zigzag) a poor rating. (Read the comments)
The same holds true for zigzag.com: http://www.mywot.com/en/scorecard/zipzag.com
This site says it carries a $19 fee. I would be leery of this one too. Note the link below "Download" where it says "Before you download Scan your PC for errors". Despite the fact WOT gives it a safe rating, I'd steer clear of it. But that's just me.
My hopes are..... with Edwards instructions you might not need it. .Or you'll be able to find something less questionable which will do the job for you.
As I've said in the past, WOT may not be 100% correct 100% of the time, but it sure is a good guideline.