Servoy 2019.x on MacBook Pro 16" & macOS Catalina

Hi,
well I now have my lovely MBP16 but when I tried to run a Servoy 8.x Developer, it showed the ‘requires old Java’ message, I downloaded it, ran installer, but it wouldn’t install as it said a newer version was already installed!
Is there an OpenJDK version of Java, or another one I can manually download that will let me run Servoy 8.x?
[But I do have a newer 2091.x version running that came with it’s own Java…]
Or do I need to redownload the all-in-one version for Mac with the ‘firstuse’ file (i.e. the one with built-in Java), and if so, how do I access older releases to download??

Thanks
Rafi