After 3 days i solve this problem ones for all
if u go to c/NVPACK you can see Android-sdk-windows if u open this folder u can see Android-sdk-windows again unreal search for api 23 in the first folder but Androidworks install apis in the second one !! You dont have to set unreal to see api in the second one becouse if you do this after your apk is done you cant install it in your device becouse it continues to search Android stuff in wrong place . SOLUTION: copy all the content of the second windows folder in the first one . 