I tried starting Sentinel so I could get the latest firmware for the SDS100. It wouldn't start indicating to me of some sort of .NET Framework 2.0 issue. I went to the "Turn Windows features on or off" and the .NET Framework 3.5/2.0 option wasn't showing like in this screenshot.

After rolling back updates, the .NET Framework 3.5/2.0 option still was missing and Sentinel still wasn't starting. To make a long story short, I found this link
blogs.windows.com
See this section
After I downloaded and installed https://go.microsoft.com/fwlink/?linkid=2337635 Sentinel started to work again! The "Turn Windows features on or off" dialog still doesn't show the .NET Framework 3.5/2.0 option so I take it that is the new norm.

After rolling back updates, the .NET Framework 3.5/2.0 option still was missing and Sentinel still wasn't starting. To make a long story short, I found this link
Announcing Windows 11 Insider Preview Build 27965 (Canary Channel)
Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 27965 to the Canary Channel. What’s new in Build 27965 Introducing the new Start menu for Win
[.NET Framework 3.5]
- Starting with Build 27965, .NET Framework 3.5 is no longer a Windows Feature on Demand optional component. We encourage customers relying on the legacy framework to move to modern versions of .NET. Customers running business-critical applications that still depend on .NET Framework 3.5 can access a .NET Framework 3.5 standalone installer located here: https://go.microsoft.com/fwlink/?linkid=2337635.
After I downloaded and installed https://go.microsoft.com/fwlink/?linkid=2337635 Sentinel started to work again! The "Turn Windows features on or off" dialog still doesn't show the .NET Framework 3.5/2.0 option so I take it that is the new norm.
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