“jdk-14.0.1.jdk” is damaged and can’t be opened - when installing JMC / JFR afterwards
I think the problem might be that after I've installed the JDK I then go ahead and unzip (untar) the JFR (including JMC) package into a sub-directory of the JDK. I think that macOS detects that there has been a change and tries to protect you incase its a malicious virus attack.
I tried installing the JFR in a separate directory and then initially I got the same message when trying to run it. But then I found a post which suggested going into the macOS&gt; System Preferences - Security &amp; Privacy screen and there was a message asking if I wanted to give permission for this application (Java Mission Control) to run. I did and its worked fine since.