There is no direct public download link. You must acquire the software through official Honeywell Gent channels as a certified partner.
Attempting to download this software from third-party "file sharing" or "warez" sites is strongly discouraged. These versions may contain malware, may be corrupted leading to panel configuration errors, and lack the necessary hardware dongle drivers required to save configurations to the panel. gent vigilon programming software download link
Understand the needed to connect to the panel once you have the software. Adding devices to honeywell gent panel without software? There is no direct public download link