Apparently, some folk are having problems getting this version registered now.
After doing format/reinstall of OS yesterday I thought I might have the same trouble, and I'm not entirely sure if my workaround was the reason it's up and running again, but for what it's worth...
Before formatting yesterday, made a copy of the entire shadow folder in system32. This being the registered English version.
Today, after reinstalling OS, I installed the chinese version of Powershadow again, and then replaced the entire folder in system32 with the one I copied yesterday.
Working fine. Hope this helps.