once you've installed the items you can just move the new .dbc file over to the new one that you have in the mods folder (if you've gone through the fix post-patch)
You may have to change the 0 to another number but this does work as its how I currently get new files into my game.

I managed to finally get my saves to work after removing all traces of Riverview from my game.
It meant digging through a lot of folders.
Then I just grabbed my riverview file from an old back up and placed it in the new destination and got it working finally 

Thanks for your help though. After reading through your post it became apparent what files may have caused the trouble 

I've updated my game recently and spent roughly 2 and a half hours getting Riverview and my Sims store bits back. 

Now I've come across an issue, in that I can not save a family in Riverview. As soon as I save and exit or go to main menu (after saving) thats it they disappear. This isn't an issue with sunset valley, that saves and plays fine.

I've now lost my main family as they were in Riverview 
I've deleted all the old saves for Riverview so I can create fresh ones but it hasn't worked, at this stage I'm a bit stumped.

Anyone have any ideas on how I can fix this?
If I can't fix it I guess I'll stick with sunset valley until EA breaks that one too. Thanks in advance for any help.

Thanks everyone for the help. I've spent 2 hours trying to make heads or tails of whats gone on with all the store content and how to get it back.

I finally managed to get it all to show up after realising I was editing the wrong resource (one I didn't even need!) from the files folder that came with the framework and the one I needed to edit was sitting outside of that folder.

Easier way to follow (this cleared things up for me) I found at
http://www.modthesims.info/showthread.php?t=382520
(its basically what elliebanne posted but with a few pictures to make it easier to understand)