I am getting an error 0x80070057 when trying to download my pre-order Halo Wars 2 from the Windows App store. I’ve followed the steps outlined in the following link and changed the registry settings, but the problem persists: https://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_update/windows-update-error-0x80070057-windows-10-tp-9926/34cc0917-f49b-4f1d-b351-54bdc6942a71
Please help ASAP
I have also rebooted multiple times and tried disabling my antivirus/antimalware programs.
I would reach out to Xbox Live / Microsoft Support on this one OP, they’re be able to help you out with issues like that:
http://support.xbox.com/en-GB/games/game-titles/halo-wars-2-info
As a last note, please don’t post multiple times in a row. You can edit your last post if you need to add more info 
Thanks for the reply. I got it working - turns out that the error shows only when I choose any of my external harddrives for the install. When I finally chose C: drive (against my preference) it started downloading.
See you in-game!
Great stuff, glad you got things sorted. If you need any further help feel free to start a new topic 