The .NET Framework 1.x runtime is no longer supported, and the .NET Framework 2.0 runtime (used by v2.0-3.5 applications) won’t be supported after 2029. They ar

The .NET Framework 1.x runtime is no longer supported, and the .NET Framework 2.0 runtime (used by v2.0-3.5 applications) won’t be supported after 2029. They are slowly abandoning support for old apps. (Yes, if you fiddle with the config file they might work on the .NET 4.0 runtime. But that’s not something a typical user can/will do.)