First my apologies, I get the feeling that English is not your primary language, also, you are not very good with computers.
If I am understanding correctly you are trying to play the Big World map, so let's try unzipping the map. First try renaming your "downloadedmaps" directory to "holdfordownloadedmaps" then create a new "downloadedmaps" folder. Next open the big_world-master.zip file and drag the "big_world-master" folder inside to the new "downloadedmaps" folder. Once this is completed, rename the "big_world-master" folder to "big_world".
Now start TripleA and see if you can play.
Hope this is helpful.
Cheers...