to be honest the tutorial section for zip align is about 1 year old and surely by now there's a better way to do it.
I didn't have any success when I tried that method about 6 months ago. After how ever many gigs worth of developer kits just for 1 or 2 tools for zip aligning, signing etc and a migraine... I gave up feeling thoroughly defeated.
I would pay good money for a Construct 2 add-on that did it for me.