Solution by alexanderokosten

This guide explains how to install .NET Framework 4.0 and 4.5 on VS 2022, as it doesn't support these versions out of the box. Microsoft says these versions are outdated but many people still need them to maintain legacy apps.

Requirements:

• VS 2022
• 7-zip (I haven't tested WinRar)

Notes:

• When .NET 4.0 is mentioned, it means .NET Framework 4.0
• When it's mentioned to open as an archive or un-zip, use 7-zip

The steps:

1. Download the .NET 4.0 Reference Assemblies from https://www.nuget.org/api/v2/package/Microsoft.NETFramework.ReferenceAssemblies.net40/1.0.3
2. Once downloaded, open them up as an archive
3. Navigate to Build > .NETFramework
4. Keep 7-zip open and open the folder C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework
5. Delete the existing v4.0 (or make a backup)
6. Extract the v4.0 folder from 7-zip into the folder (make sure to not extract the contents but the folder itself)
7. Open Visual Studio 2022 and now you should see .NET 4.0 as a .NET Framework target