Windows 10 Streaming and Microsoft Store Download Help.

Hi

I tried to stream Forza 4 to my PC and everything seams to work OK apart from no sound and an inability to Press A to start game. the pad works fine in widows moving about the xbox dashboard so I am at a loss as to what is causing this as other games work fine.

As a side step to thisa I went to download it directly to my PC from the windows store but it appears that the game is not there but all my DLC is. Does this mean I cant install the game on my PC because I bought the disk?