I am facing the same issue. Though it may be not officially supported, Vray 4 from the nightlies works fine so far in 3ds Max 2022. At the moment I neither need nor can afford the upgrade to Vray 5. The annoying thing here is, that Max crashes even though Forest Pack is not even used in the scene, just opening the material editor is enough. Can you do anything about that, that it is at least not crashing? Or even better, make it still work with Vray 4?