We regularly publish updates of your ACT! add-on. To make sure you have the latest update, go to your add-on Help>Check for update menu.
It will connect itself to our server and let you know if a newer version is available. To install the newer version, you'll need to close ACT!. If the time is not right for you, you can choose to download the update package immediately and install later.
If you need to reinstall the addon, just go to our download page and download the latest version. Your license number will be automatically detected.