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Control Panel -> Add/Remove Programs
right click "Visual Studio 20xx" -> Change
Check ".NET desktop development"

Download Offline package

.NET Framework 4 – 4.6 development tools:

--add Microsoft.Net.Component.4.5.2.TargetingPack `
--add Microsoft.Net.Component.4.5.TargetingPack `
--add Microsoft.Net.Component.4.TargetingPack `
--add Microsoft.Net.Component.4.5.1.TargetingPack `
--add Microsoft.Net.Component.4.6.TargetingPack `
--add Microsoft.Net.ComponentGroup.TargetingPacks.Common `

These options are available in Visual Studio 2017/2019：