Honestly? No.
Vijeo Citect 7.3 had several Service Packs (SP) and patches. It is highly recommended to install the latest Service Pack available for v7.3 to fix bugs and security vulnerabilities. vijeo citect 7.3 download
During install, you will be asked about licensing: Honestly
Pro-tip: Do not plug in the USB dongle until after the installer reboots the PC. This prevents driver conflicts. Pro-tip: Do not plug in the USB dongle