This has been coming up a lot on the Silverlight.net forums, and two times already I've seen discussions about this. Once in my inbox and once in a Silverlight group.
The best explanation I've seen so far was from Tim Heuer, and I don't think he'll be upset if I quote him here:
"Let me try to help. If you have 1.1 installed, then it is not auto updating (only the RC is autoupdating). There has been a lot of confusion out there with people thinking “well, I have both.” – you really can only have one installed (quick test at http://timheuer.com/wpfe/versiontest). If you are actively developing, I recommend using the 1.1 Alpha Refresh. Installing that automatically gets you the ability to run 1.0/1.1 applications.
One caveat is that the 1.1 does not autoupdate…so when the new releases come out you’ll have to download/install.
You can get the latest build of the 1.1 alpha refresh here: http://www.microsoft.com/silverlight/license-win-dev.aspx
Hope this helps,
-th"
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posted @ Monday, August 20, 2007 8:54 AM