Hi @Nigel_Pain
To see if the SAS 9.4M7 software you have installed has a requirement for .NET the best place to check will be the system requirements documentation. Search | SAS Support
It's possible that the .NET installed on the Windows server that is your SAS Middle Tier is for something other than your SAS software, for example .NET is required for Windows PowerShell.
The .NET 4.8 on your Windows servers for metadata, compute, LASR would come from the requirement for SAS Foundation on Windows. You can find this note in the Software Requirements section of System Requirements--SAS 9.4 Foundation for Microsoft Windows for x64 "SAS software requires the Microsoft .NET Framework, which SAS provides as a convenience. SAS obtains the latest version of .NET as a system redistributable from Microsoft when preparing SAS software for release." Some SAS clients also require .NET, for example SAS Enterprise Guide.
You can look at the <SAS software depot>\install_doc\<order>\ordersummary.html to see what .NET version was provided in your 9.4M7 order and that will be a .NET 4.8.
If you still have questions, I recommend opening a track with SAS Technical Support.
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