Nothing works! "Select a volume where the /The Sims 3.localized/The Sims3.app is already installed"

Hi Guys,
I've downloaded, Sims 3 online and it works perfect. So I've downloaded the expensions packs however, when I try to install it it says: '' Select a volume where the /The Sims3.localized/The sims3.app is already installed''. I know there is a topic about this problem but i tried everything and nothing works!


Can someone help me please??



Mod edit: moved to the right section.

- Carlos

Really sorry for the late reply.
Have you found a solution to your problem ?

you just need to go to applications when this shows up

The default when you installed an expansion pack is the Finder > Your Name > Applications. I think there's like 2 Applications folder. Select the Applications under the 'places', you know what I'm saying? Hope this helps, I got this problem too!