Hello,
It is possible that the feature is disabled, please try the next:
1.Hit the – Win+S.
2.Type – windows features.
3.Press the – Enter.
4.Select the box for – NET Framework 3.5 (includes .NET 2.0 and .NET 3.0).
5.Also, fill the check box set before – NET Framework 4.8 Advanced Services.
6.Next, click the – OK.
You can also try to enable through CMD as Administrator with the next command line: Dism.exe /online /enable-feature /featurename:NetFX3 /source:C:\ /LimitAccess
Install any pending Windows Updates, and if the issue still appears, try the downloadable installer at: https://www.microsoft.com/en-in/download/details.aspx?id=21
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