Windows 10: Can't download or do any updates at Microsoft Store

I recently acquired a game key at Microsoft Store and when I try to download the game the download bar either goes white and doesn't start or it starts but it stucks at pending. I included some images at what's happening after I click download, the bar disappears entirely.I tried resetting the store, doing troubleshootings and some of the suggestions from the similar problems and I saw that when I click get updates at the store's own update page same thing happens, it stucks at pending too.

:)

 

Microsoft Download Center Updates

Quite a few new downloads popped up today on the Microsoft Download Center. Here's a list:
* Windows Media Center Software Development Kit
* Windows CE 5.0 Networked Media Device Feature Pack Monthly Update (July 2007)
* Microsoft Forefront Server Security for SharePoint 10.x Management Pack for Operations Manager 2007
* Microsoft Server Network Load Balancing Management Pack for Operations Manager 2007
* Microsoft Identity Integration Server 2003 Management Pack for Operations Manager 2007
* Microsoft Office Project Server 2007 Management Pack for Operations Manager 2007
* Windows Embedded CE 6.0 Monthly Update (July 2007)
* Microsoft Forefront Server Security for Exchange 10.0 Management Pack for Operations Manager 2007
* Windows CE .NET 4.2 Platform Builder Monthly Update (July 2007)

MS Download Center

 

How can I free up space taken up by an incomplete Microsoft Store download?

Found the solution. Steps I used to fix this:

1. Open the C:\Program Files\WindowsApps folder, which is where the Windows Store puts its downloads. The WindowsApps folder isn't permissioned to normal users, so this has to be done using some utility that's being run as administrator (either a command prompt window, or some other file manager like 7zip; h/t ManSamVampire for the 7zip suggestion). DO NOT assign ownership of the WindowsApps folder to your own user account to gain access to it, as doing so will cause major problems and can't be easily undone (h/t Ramhound's answer for this warning).
   
2. Sort the subfolders inside WindowsApps by the date they were last modified; this will let you easily find the folders that have recently had new stuff put into them.
   
3. In my case, the offending subfolder was called MSIXVC, which is apparently a type of installer used by the Windows Store. Inside, I had an anomalous 37GB file created last night with no file extension, called "8BBF2763-A1C6-4F1B-96CA-B79DD5FDA4EE". Given that this file was enormous, created at the right time, and in a subfolder suggesting it was an installer, I concluded that this was the droid I was looking for.
   
4. From within your run-as-administrator utility, delete the offending file. I deleted the ginormous, bafflingly-named file from the MSIXVC folder, and lo and behold I had all my disk space back!
   

Now redownloading and installing Outer Worlds. This time I'll know better than to turn off my computer partway through.

 

Microsoft Store free apps

Hello,

Corrupted system files can cause issues when downloading applications from the Microsoft Store. However, for us to provide you the most appropriate assistance, can you provide us the exact error message that you're getting?

As an initial troubleshooting step, we suggest that you reset the Microsoft Store cache and try to download applications again. Check out the steps below:

• 
  Press Windows + R keys to open the run command box.
  
• 
  Type WSReset, then try launching Microsoft Store and sign in.
  
• 
  Once done, try to download applications.
  

We'll wait for any updates to assist you further.