You need to reset/un-corrupt the cache in Windows store it seems.
Go here. Fix problems with apps from Microsoft Store - Microsoft Support
Run the troubleshooter and it should fix the cache and remember where the download stops so it dosent reset to Zero. If you don’t like clicking links, just google Windows Store Troubleshooter 
Enjoy Lads.
giving it a go, found one error for the store, will tell you how it goes in 12 hours if it resets again!!
Hopefully you wont let me know because you will be playing, an update would be great tho
Yeah have downloaded it completly and the only thing i have done is run the Diagnostics and Troubleshooter you have linked to. Thanks for your help, now to try the game out…