I have the same problem. If I update the wallet will the address change? Its because I have bought some more coins but haven't recieved them yet because of the sync is super slow, however the seller has sent them. I don't want to lose the coins in cyberspace if I update my wallet.
Nope, the client is what you are updating. You will still have the same addresses. The wallet.dat file is the file that saves your addresses so just make sure you have a copy of this in a safe place just in case.