Win10LTSC-Add-MicrosoftStore

Put all the files in the same folder, then run Powershell with administrator privileges and execute Add-AppxPackage *

Another way

1. Open https://store.rg-adguard.net/

2. Choose PackageFamilyName, search Microsoft.WindowsStore_8wekyb3d8bbwe, and download 5 files.

3. 

4. Put all the files in the same folder, then run Powershell with administrator privileges and execute Add-AppxPackage *