I may become boring but I have to ask about this... when I downloaded the game , the file was for e.x (simcity_6st9yij4.jar). (I use winrar). When I click to the zipped file I find inside - .class - extension files and other irrelevant things. Some say rename the file , tools-view-deselect hide known extensions etc. which file I have to rename? I renamed one class file that was written in caps but went zipped also. please.... dont send me to a topic or something, I've read them all. thanks anyway.

You need to rename the extension from ZIP to JAR. Instructions can be found easily if you have a look through the pinned topics and the rest of the topics on this page.

I agree with you, but I already mentioned that I downloaded the file as - .jar-. You are telling me that I have to rename the file extension from ZIP to JAR. Okay. But what happens when I have a zipped file with JAR extension?

there your pronlem.
dont rename the file just install the jar file as is to your phone. dont extract it or anythin like that

Follow THIS guide and use the search in future before posting.