- First, uninstall the previous version you have. This can be done in Add/Remove Programs on Windows or by just deleting the app on Mac.
- Ensure you have Silverlight 4 installed. If you are using the development tools and have installed Silverlight 4 developer tools, that’s fine. If you are not a developer, visit http://microsoft.com/getsilverlight to get the latest Silverlight 4 version (4.0.50401.0).
- After you have Silverlight 4 installed, visit the app page and install it.
You should be good after this!
So why so many uninstall/re-installs!? I thought you had an auto-update mechanism!
We do! With Silverlight 4 trusted applications, the update mechanism requires that your applications be signed in order to use the auto-update APIs. We wanted to wait until SL4 released in order to provide a signed version (and our internal signing process didn’t allow signing the beta). Now that we have a signed version, you’ll be prompted when an update has been installed for the app. For more details on signing your Silverlight applications see:
Hope this helps!