During your one-year support period, you can enter the internal support site to download the latest builds and scripts. You will need your customer care information to log in. That's in the email you received after registering your latest serial (did you?)—the email that contains your permanent authorization information and has the subject line: "SynthEyes Registration (SAVE THIS MAIL)". To download your proper SynthEyes build you will also eventually need your full serial number.
If you have trouble logging in: First, make sure you are using copy and paste to enter the login information; watch out for zero versus oh, one versus el. Second, consider the possibility that your support has expired, see the additional information on this page.