Fix The Error Easily
This error comes whan your phone memory is near to full.
And it's common problem in Android specially in lollipop version. Because it's uses ART Run time and apps taking more space than their original size.
So I'll tell you what you have to do so get more memory by cleaning cache.
Instructions
1. Uninstall Unneeded Apps
2. Move all movable apps&games to sd or move unmoveble apps using link2sd.
3. Download App Cache Cleaner.
4. Clean all apps cache
5. Done
Now try to download app from play store now it will not give you insufficient space error.
If you still getting error try factory data reset.
Need Help or any question drop your comment below.