You must enter the first four characters of the Product Serial Number found on your software security card.
The primary gateway for all current software versions is the official portal.
For older versions like Amaya OS V9 or V10, region-specific support sites like Amaya Sales UK provide direct links and drivers. Identifying Your Software Version
Your machine model determines the highest compatible software version: Versions 4 through 9. Amaya XT: Versions 7 through 10. Amaya XTS: Versions 9 through 10. Melco EMT16 / EMT16X: Version 11 and above. System Requirements for Installation System Requirements - Melco Downloads