Net Framework 4.0 Targeting Pack

Without it, you cannot generate an assembly that the legacy COM control will accept. You cannot replicate the exact memory layout of the 2011 binary.

: You can have multiple targeting packs installed simultaneously, allowing one machine to develop projects for various .NET versions (e.g., 4.0, 4.5, and 4.8). Why Use .NET Framework 4.0 Today? net framework 4.0 targeting pack

Unlike 4.5+, the 4.0 Targeting Pack does not have the async/await down-level bindings. If you try to target 4.0 but have 4.5+ installed on your dev machine, the compiler might accidentally bind to System.Threading.Tasks incorrectly. This is precisely why the Targeting Pack is required. Without it, you cannot generate an assembly that

, you might notice that .NET 4.0 is missing from the list of target frameworks. Microsoft intentionally omitted components for versions 4.0 through 4.5.1 in newer IDEs because they are no longer supported. How to "Bring It Back" (A Modern Story) Why Use