There is a small bug in the installer code dealing with Install By Category. It used to work for me; I changed something; now it does not work. For the life of me I can not figure it out. All my testing code has the entries in the proper order, but then they get mesed up or dropped completely. Until I figure it out, replace your 5.6 WPIScripts\installer.js file with the attached one.

It will also be replaced in the full archive file.

Really Thanks to you i past a lot of hour to search my fuc*** problem and finally i tried this file and all work now. You made my day.

It's not a fix, it's a work-around. The bug deals with Select All and Select None. I can't figure it out. When starting WPI and hit install, all works fine. But if select All or None, then pick a few files, they don't get "selected" for some reason. They show up in the list, but they get messed up when extracting them. It only happens if "Install by category" is selected. I haven't had much time to work on it, but will get fixed. Probably something simple/stupid I am overlooking.