This has nothing to do with upgrades at all. Supporting Nitrous was a significant amount of work and implementing it required a lot of changes in the V-Ray code. It was problematic to port these changes back to the 1.5 code branch and make them work reliably. We are not forcing anyone to upgrade - we will provide a version of V-Ray 1.5 for 3ds Max 2012 (which you can get even now if you need it right away).
Best regards,
Vlado
Best regards,
Vlado
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