You dont need make folder. Zip z01 z02 should be in the same folder and just uzip.. by .zip do not open others and you can get apk that can install game
I installed game by apk but the other 2 don't come as zip files but I did download them. Not sure what to do with them though since not zip files thats how they show up and I'll attach another file of showing what end of the file name says for you. Game worked just suddenly closed itself off after about 25 mins of playing but happy about purchase, seems interesting so far and would recommend others buying it.