You can't just copy a program from one place to another. Programs need to be installed as they integrate with the OS, especially an AV/IS program such as McAfee.
What you could do is run a program such as
Magical Jelly Bean Keyfinder that should fine the license keys for the programs. You can then download the programs from their web sites and install a fresh copy and add the found license key.
For the likes of McAfee you should be able to download the latest version even if running an older version on your current setup, as long as it is the same type ie Anti-Virus or Internet Security. However you are unlikely to get away with a newer version of most other types of program so would need to find the exact same version.
Mark.