First, a quick technical recap:
So if you’re trying to run a new V-Ray version on an old host, it simply won’t install — regardless of serial number.
What you actually need:
V-Ray 3.4 for C4D R17 (build date around 2016–2017) with a valid license for that version. vray cinema 4d r17 serial number work
It is a common search to find "serial numbers" online for older software. However, using cracked serial numbers for V-Ray often causes more problems than it solves.
If you have a legitimate serial number for V-Ray 3.x and have lost your license file, you will need to contact Chaos Group support. Even for older versions, they can often reset your license or provide the correct files if you have proof of purchase. First, a quick technical recap:
If you bought V-Ray for C4D in the past (perpetual license), log into your Chaos License Server (version 5.5.5 or older, compatible with V-Ray 3). You can still activate V-Ray 3.6 offline if you have the original installation file and license file (.vrl or .lic).
Steps:
Contact Chaos support — they sometimes help legacy users reactivate.