Error Code 00000008:ffffffffffffffff

@TheSaturday6  I don't know whether this is a permissions issue for this particular Windows account or not.  The point of creating a new admin account is to test that theory: if the new account can download the SDX content, then the current account is the issue.  But if the download fails in the new account, we need to look elsewhere.

Creating a new account is not difficult at all and should only take a couple minutes at most:

https://support.microsoft.com/en-us/windows/create-a-local-user-or-administrator-account-in-windows-20de74e0-ac7f-3502-a866-32915af2a34d

However, if you'd prefer to try something else first, you can use the "takeown" command on the Documents directory to reset its permissions.

• Restart your computer, and don't open any applications
• Hit Windows key-X and choose either "PowerShell (Administrator)" or "Windows Terminal (Administrator)," whichever option is offered
• In the window, write this command:  takeown /F "[full file path]" /r  with the quotes.  In this case, you'd write "C:\Users\[your username]\Documents" except with your actual username inserted.
• Double-check the command (take note of the three spaces in the command line), and when you're satisfied, hit Enter
• Restart your computer before testing

But if this doesn't work, it's still worth testing a new admin account.