For the software house where I work I extend an Open Source IDE (SharpDevelop) with framework 4. I use VS2015 and I added NuGet package Microsoft.Bcl.Async to use async/await keywords.
But there is a problem. If in the user's PC is installed only framework 4.0 (not 4.5 or greater), needs to install fix KB2468871.
There is a way in wix project to detect if fix KB2468871 is installed? If there is a way, if not installed, can I install automatically?