[Q] Galaxy Trend Plus Play Store problem

Hello I own a Galaxy Trend Plus and today i tried to download Asphalt 8 from play store. My device has 4GB of internal storage (1.2 GB free) and a 16GB MicroSD class 10 (9.5GB free)

When I try to download the game this is what's coming up:
isn't external storage the sd card?? 9.5gb free -- asphalt 8 is like 2gb in size...

Help please??

UPDATE:tried changing the install location with adb shell but problem persists...