Installing Silverlight 4 app with sllauncher does not work

Answer 1

I managed to get this working - I am not entirely sure how but I started by erasing the existing references installed folders here:

C:\Documents and Settings\Rod\Local Settings\Application Data\Microsoft\Silverlight\OutOfBrowser\index

It seems a little flaky (at one point the install worked but the app just showed a white screen) - but start by looking at the file in the index folder above to see if your xap is being copied to the correct folder.

I will leave this up as it has some good clues on how to solve this.