I have compiled a 64-bit version for OSX. I tested it on my Macbook pro (still running OSX High Sierra) and on a virtual machine (still running on OSX Sierra), and it worked on both but I can’t tell you for sure that it will run on Catalina, so give it a go:
Web installer (32 MB): https://drive.google.com/file/d/1knrZ_7CfXXT71mmyCNUtK5uTD86Eiu3X/view?usp=sharing
Full installer (879 MB): https://drive.google.com/file/d/1Wf6VVIdVJFEr1TESJ242Ct7eWlidhnKS/view?usp=sharing
Note: either way, you will have to download about 900 MB: the only difference is that the web installer will download the other 800+ MB during install whereas the full installer requires the download up front. When I tested them, the web installer was unable to connect to the matlab URL it needed to in order to download the rest of it, so you might be better off with the bigger download…
I tried to open the installer, but I got a message saying that it “can’t be opened”. I don’t know if it has to do with macOS Catalina or not, but something’s not right.