If you look in your AddonPackages folder you will probably see duplications with " (2).var" written at the end of the file name. You probably pasted them into a folder that already contained them. That "( 2)" is messing with the file naming convention, which should end with the version number.var. If you get rid of the duplicates or delete the "( 2)" some of these messages will go away. I'm not sure about the zip thing, but If you bring up the package manager in game, you can search for the missing dependencies listed too. Some of them may not be on the hub though.