Cannot install silverlight 4 tools on visual studio 2010 sp1

Question

I\'ve installed Visual Studio 2010 (fresh install), then applied the SP1. Now I\'ve tried to install the silverlight 4 tools, but i\'m getting a strange error message :

Answer 1

Thought I propose a bit more detail about installing FSharpRuntimeSL4.msi manually... for myself this alone did not fix the issue. I needed the Silverlight 4 Toolkit 9April 2010)

First if you had the SilverLight 5 runtime at some point you will have to remove it.

Then extract the Silverlight4_Tools 4 files as proposed above. I had to run everything to finally get an old solution to compile properly:

1. FSharpRuntimeSL4.msi
2. SilverlightTools_Package.msi
3. silverlight_developer.exe
4. RiaServices.msi
5. VS10-KB982218-v4.exe

After that I was able to install the April update.