What is your base game version right now ?
To find out, open your launcher and hover over the little base game icon in the lower left part of the launcher. It should say 1.50.
More Details can be found here: http://sims3.crinrict.com/en/2011/01/tutorial-how-to-find-your-game-version.html
For Macs: http://bluebellflora.wordpress.com/the-sims-3-on-a-mac/checking-which-patch-version-youre-running/
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For PCs there's usually also a log that can be found in documents/electronicarts/thesims3 and is called Sims3LauncherLogFile.log
Post the content here if you have that too.
Okay - The Launcher has just made a liar out of me.
It said "your game is up to date" when I clicked the Game Updates button, as it had when we re-installed the game at the end of May (after a long hiatus due to the shenanigans necessary to use custom content back in 2009) and let it update itself until it said there were no more updates.
I Just now clicked the Refresh button and it says theres a new update (from February) to 1.5. Words can not express how much I despise this Launcher...
I'm leting it install that and will see if Riverview will then download.
It really should work.
(I hate the launcher too)
Good Luck.
