It seems that Activiz is not open sourced so you can’t build it yourself I fear. So, I believe you have to ask the project maintainers (https://www.kitware.eu/contact/) which is the most recent tag of VTK that is fully compatible with your current version (in full detail) of Activiz.
Not only the specific source code tag, but you will also need the exact VTK build configuration they use to build Activiz. Differences in configuration often also result in incompatibility. If they say they customize or patch VTK code before building then you’re likely out of luck.