After upgrading to Mac OS Catalina, I have had troubles with Matlab 2019a. Unfortanetly, the installer for Matlab 2019b does not work either. Here is the error I get when I run the 2019b installer.
Error : unable to connect to host.
sun.security.validator.ValidatorException: PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException: unable to find
valid certification path to requested target
Should I remove the 2019a installation, before installing 2019b?