I know the best way to send updates is through DLL's, but how do you exactly try to send the update?

What I've tried to do is create a new Package through the Package and Deployment Wizard and then I exclude the .EXE file, but when I run the previous EXE after supposedly running the new SETUP file with the updated DLL, it still does the previous function, even after I rebooted.

Any help would be greatly appreciated.