If you use Google Play Music and have a Windows 8 device you will want to try Outcoldplayer in the Windows Store. Outcoldplayer is a 3rd party Google Play Music app that has offline playback and works with Google’s all-access subscriptions.
The app has been updated including several bug fixes, library syncing issues have been fixed and a bug preventing songs being added has been fixed. If you a Google Music user the app is well worth checking out and costs £3.99 from the Windows Store.
##09/07/2014 – Version 3.1.10 (Windows 8.1)
* Some users could have issues with library syncronization.
* Some users could have issues with adding some songs to the libraries.