android apps not getting dowloaded from playstore
Maybe simply there isnt enough storage as stated in the error.

Apps are installed in data patition not your internal sd card. Dont be misleaded by that. There are /cache /data /system partitions .Preinstalled system applications are in read only /system partition. When you install app from play store it will be installed in /data partition and its limited. My 16 GB phone has only 2GB data partition

Try to clear some other applications data