Windows 10: How to programmatically distinguish between LTSC & GA versions of Windows 10 21H2

In .Net how to programmatically check if the windows version is running Windows 10 21H2 LTSC or GA. As far as I understand, they are both using the same build 19044 and the only difference seems to be the product name in the registry @ HKLM\Software\Microsoft\Windows NT\CurrentVersion\ProductName where "LTSC" appears in the value for LTSC and its not present in GA.Is there another way to distinguish between the 2

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MS Store crashes on LTSC Windows 10

I am using Windows 10 LTSC and i've gotten Windows Store installed. However it keeps on crashing. I've tried all the recommended steps (wsreset, troubleshooters, reinstalling with powershell etc) and none of them worked at all, troubleshooter didn't even pick up any issues. My current version is LTSC 21H2

 

Update Windows 10 version 1909 to version 21H2

Can I Update Windows 10 version 1909 to version 21H2 (latest)?

Then Please send the useful steps to do that...

By changing windows version 1909 to 21H2 does it removes all files(music, videos, software,etc.) present in my laptop or it is safe, nothing will be deleted.

Now I am not getting critical updates for windows version 1909.

Please anybody give suggestion regarding this matter.

 

How can I find whether the Windows OS in a machine is LTSC version or normal one via Registry Keys? What possible commands can be executed to retrieve whether it's LTSC or Normal OS?

I want to write a logic to block the program if it is being run on Windows 10 21H2 (Enterprise/Pro) as it reached EOL, but allow it to execute if it's running on Windows 10 Enterprise 21H2 LTSC (Windows 10 Enterprise LTSC 2021)

How can I retrieve the exact version running in the machine in order to differentiate Normal 21H2 and LTSC 21H2 OS?

The Solution must be transparent enough to get LTSC version from any language for ex., Spanish\German\Italian\Chinese\French Windows OS as well.

Kindly provide some insights on this!!!