Guess most people have come across, Play Store not downloading or it is taking too long, and starts downloading when there is a WLAN connection and getting a message like the file is big to download for your data connection.
Here is what you do to download favorite apps at your will,even on a data connection.
Just set your setting to download limit to Unlimited, Goto Tools Folder>Downloads>Option (3 dots upper right hand corner) >Settings>Download Size Limit to Unlimited.
Now restart all your app download. It should be fine.