Yesterday I discovered, that i can download apps from Google Play only with WIFI.
Today I changed setting for the internet in Access Point, and now I can download normally. Authentication type wasn't set.
I hope, that was the problem with my internet also, because was working, not working....
About FC I will change and see - it was like that: I downloaded apk file from xda, click on it from the pull down menu - FC. Than i went to the app Downloads, from there was OK.