Fix Playstore not downloading apps.2015
The problem is in a dedicated download manager that every Android phone comes with. Downloads fail when the caches are corrupted. To solve this, you’ll need to just wipe the cache.
To wipe the cache, go to:
Swipe right to “All” and select Download Manager
Then wipe the cache and restart the device.
Alternatively you can press and hold the app(in some phones) and drag it to app info icon that will appear then click on clear cache.