Microsoft has announced that .NET Core updates will be made available through Microsoft Updates on Windows from December 2020.
The terminology can be confusing, especially for lay users who may only know about Windows Update. The main difference between the Windows Updates and Microsoft Updates is that the latter include updates for other Microsoft products as well.
You can enable an option in Windows Update to receive updates for other Microsoft products through the automatic updates feature of your operating system.
In Windows 10, open the Settings app. On the Update tab and better safety – Advanced options check “Get updates for other Microsoft products when you update Windows”. 
Microsoft says the change gives organizations more control over the update process, as .NET Core updates can be installed through Microsoft Update / Windows Update as soon as it is released, completely optional.
To date, .NET Core updates have not been available through Microsoft Update due to concerns that the updates may present functionality issues.
Administrators will be able to block .NET Core updates through Microsoft Update. Microsoft has released some registry keys to block some or all .NET Core updates. The following keys work on managed and unmanaged devices.
| .NET Core Version | Registry Key | Name | Value |
| Block all .NET Core updates | [HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ .NET] | BlockMU | dword: 00000001 |
| Block .NET 5.0 updates | [HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ .NET \ 5.0] | BlockMU | dword: 00000001 |
| Block Core 3.1 updates | [HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ .NET \ 3.1] | BlockMU | dword: 00000001 |
| Block Core 2.1 updates | [HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ .NET \ 2.1] | BlockMU | dword: 00000001 |
You can use archives registry to apply the changes to your system. Just download the file below and extract it to your system:
You will find four registry files in the file that block 1) all .NET Core updates, 2). .NET Core 5.0 updates, 3). .NET Core 3.1 and 4 updates). .NET Core 2.1 updates.
Check the Microsoft publication for more details.
