Nvidia is pretty good at keeping these up-to-date unless you insist on getting all the integrations immediately with next 4.x.0 release. Sometimes, some integrations lag behind and people from community upgrade them. I’ve done for Flex, Flow, Volumetric Lighting in 4.18 (also upgraded VL for 4.19). It’s manual work, sometimes the changes are minor, sometimes they require you to do some troubleshooting on your end to figure out what in the engine api has changed and make relevant fixes.
We’ve also upgraded some of these libs manually in past, like HBAO+ to version 3 before nvidia did an official integration for that version but the with these is that we can’t share the full integration as we can’t mix things from official gameworks repo and nvphysx (ue4 integration fork) due to the licensing limitations. is also why you will not see things like community updated blast 1.1.3 (ue4 version uses 1.1.2) or community updated flex 1.2 (ue4 version uses 1.1).