You actually have the latest update for this application and it works normally as it is. However, the company released a minor update (version 8.3.1) which improves dongle errors and minor Windows 7 issues. If you don't have problems with your current version, then there is no need to apply the latest one.
However, you can download it from the Support page through this link: http://www.premierplusembroidery.com/en/Support/Software-Help
Click 4D™ Embroidery System on the lower-right side and then log-in with the username and password for your account.