Hello, it's best to unarchive on PC (as described in game's description), then copy the files on Android.
On the other hand, you should be able to do this on Android directly, yet to extract the files you'll still need the 7zip, which for android can be downloaded via playstore just search 7zip ( https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://play.g... )
P.S.: on next update i'll try to keep the archives in zip format (not requiring 7zip or winrar).
I hope this helps