Hello and welcome to our forums,
I've checked the install conditions of both .NET Runtime and .NET Desktop Runtime and their conditions are different.
Here's the condition for .NET Runtime 9.0:

- Screenshot_216.png (11.12 KiB) Viewed 30152 times
and here is the condition for .NET Desktop Runtime 9.0:

- Screenshot_217.png (9.38 KiB) Viewed 30152 times
The condition for .NET Desktop Runtime is not met when .NET Runtime is installed:

- Screenshot_218.png (33.64 KiB) Viewed 30152 times
and therefore the prerequisite is installed just fine.
That being said, please make sure the prerequisite is not already installed on the machine.
Best regards,
Catalin
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