If you are using one of the versions of 3770Link that utilizes License Manager (Client, DLC, or AutoSync) then you must perform a few steps to upgrade your authorization.
Remove the current authorization. See Remove License Authorization... for details.
Install the new version of the software. You may simply install the new version directly over top of the current version. The installer will detect the previous version and give you the option to maintain or over-write your current settings.
Request a new Site Key using your serial number, the new Site Code, and the Removal Code. See Requesting a Site Key for details.
Authorize the new version of the software. See Full License Authorization... for details