EST3 is a legacy life safety system. Edwards (now part of Carrier) strictly controls software distribution. You cannot download SDU from a public website. You must obtain it through an authorized Edwards distributor or a licensed integrator.
If you are an end-user (facility manager), you typically do not download the software yourself. Instead, you should request the "Project File" and the software version used from your service provider. They can provide a link to a secure repository or a physical copy of the database required for your specific building. System Requirements for EST3 SDU est3 sdu software link
Start Menu → EST3 SDU (or SDU Configuration Tool ). EST3 is a legacy life safety system