I upgraded my K2 BlackPearl from version:

K2 blackpearl 4.6.1 (4.12060.1500.0).exe

to version:

K2 blackpearl 4.6.5 (4.12060.1550.0).exe

I did this on the development environment first and everything is fine, the problem is when I applied this to the staging environment, Visual Studio 2010 toolbox disappeared, I checked the extensions and the K2 extension is installed, I ran the analysis and there is not even a warning!!

I can't include/exclude kprx files from the build.

I read this article but it is not applicable in my case as I don't see .NETFramework,Version=v3.5,Profile=Client in the dropdown list!

Please Help!!