Error code 0x803F8001
thanks microsoft
Sometimes the store acts up and somehow magically it works again at a later time of day, but anyway take a look at these sites.
Or you can try the 2 powershell commands i made in this post.
https://forums.forza.net/turn10_postsm771879_Can-t-get-past-the--press-enter--screen.aspx#post_771879
thanks for the links, but I’ve already tried all of these they never work. had the same problem with fh3, had to reformat pc.
Unfortunately i had the same problem back then, had to do a clean reinstall. i tried most of the stuff above.
- Router portfowarding
- Updating windows + drivers + software
- WSReset command
- Powershell commands to reinstall apps
- DISM scan
- SFC scan
- Creating AUInstallAgent Folder and removing SoftwareDistribution folder
- Checking Windows Services
- Total Reset with WindowsRepair from tweaking.com
- Regular Windows Troubleshooters
- Clean boot without 3rd party software
- Resettings internet explorer settings
- Probably alot more
Eventually you just scratch your head and reinstall Windows 10 clean 
Yep I am reinstalling Windows 10 as we speak as I was also getting store download issues, I had to do the same thing when FH3 came out.
Windows Store is a crock of horse manure!!!
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If you are still unable to download the game, please send an email to forzafb@microsoft.com so I can look into this.
Still broken, now the download just fails halfway through.
i have the same problem will try to contact forzafb@microsoft.com
Same problem with windows store, all above methods tried, i thought the price was abit of a joke until i tried to download, 90gig to 0, ok try again 62gig to 0 wtf
Also the windows store keeps give out some wacky download speeds, for the past 10 minutes it says my d/l speed is 3 times faster than what i get from my provider but has infact downloaded nothing, There really should be some alternative to this mess thats called windows store same problem that fh3 had, i thought uplay was bad but this takes the cake
The speed indication in the Windows Store is Mbit/s (Megabit per second), not Mb/s (Megabyte per second).
So if you have let’s say a 40mbit internet provider, and you download at max speed in Windows store, it will show 40Mbps, divide that number by 8 and you will have Megabyte per second.
Anyway try this
start - settings (cogwheel icon) - apps & features - store - advanced options - reset
if that doesn’t work perhaps this one
start - settings (cogwheel icon) - apps & features - Forza Motorsport 7 - advanced options - reset
Im well aware the difference between internet speeds mb/s vs mbps ect
The other 2 i have already tried, thanks for your input appreciated
I had this too, but i think i have it working. It was download past 15gb when i left for work this morning and i never had gotten even close to that far before. What I did was update windows ( i was one update behind),installed the windows insider update thing, and used wreset to reset the store. I am hoping when i get home it finally completes.
I have got the download to 64% now, i opened the forza 7 app then i went back to the store then started the download, although on the app it still says downloading 0%
Currently downloaded 250gig of nothing so hopefully this works