Help with aftermarket soft top!!

I bought a 2011 JK with an aftermarket soft top that looks similar to the Bestop NX. It has the slanted back. It looks like you can take the rear and side windows out, but I can't figure it out. I can unzip the rear window, but no all the way because there is a metal bar bolted to the sport bar which I cannot access. There must be a trick. There is no markings on the top, so I have no idea what brand it is. The unique thing about the top is that the front and rear top sections are 2 pieces. There are no latches connecting the front to the windshield. I thought this was very strange. Can anyone help??