You shouldn;t need the Sims 2 Double Deluxe if you already have the Sims 2 installed, but you just do it the normal way, and when it asks you if you want to overwrite, just hit yes, everything will stay the same.
If you have installed double deluxe already, you should just be able to install university.
Yes you can
Uninstall the Sims 2 you already have and then install Double Deluxe
Yes you can. Just Make sure that you have installed the sims 2 double deluxe first, then install Universty.
You just install the CD and it will come up as installed.
You need to have installed the sims 2, the sims 2 deluxe, or the sims 2 double deluxe, but not all of them. You just need to have the regular sims 2 installed to install and play it.
You needn't install it, you should already have it on your computer if you have any version of TS2, look in your programs, and search "bodyshop"
You can use the Sims 2 Double Deluxe game CD.
Nightlife is included on Double Deluxe so it installs automatically with the rest of the game.
No, there is no beach in Double Deluxe. You would have to purchase and install the Bon Voyage expansion pack for beaches.
You cannot.
No, it won't. Sims 2 Double Deluxe installs the expansions "Celebration!" and "Nightlife".