The PDF manual not launching is a known defect. One can't, unfortunately.
Check out this site:
http://www.macupdate.com/app/mac/16531/power-structure
and pay particular attention to the Reviews and Comments section. What is said there about the Mac version fonts is true. The PC version, on the other hand, looks pretty good.
Here is an interesting review:
http://www.creativewritingsoftware10...g-software.php