According to https://java.com/en/download/faq/java_mac.xml , Java 6 has been disabled by Apple on MacOS. You should probably try Java 7 from the java.com or oracle.com sites.

I had the same popup reappear after installing Catalina. The fix, for me was rather simple, and quite stupid. After downloading the Java pkg I clicked on the installer and got the same security alert that others did. I then went to the window and right clicked on the pkg and selected Open. This allowed the pkg to install normally. Posted on June 25, 2020 September 2, 2020 by admin Comments Off on Solved JAVA SE 6 on Mac OS X 10.15 (Catalina) I bought a new Macbook recently which run Catalina (OS X 10.15) which is basically no different to OS X 10.11 or 10.10 – the only difference is that it slows your computer down if you are on an older model. In order to run my Photoshop CS3 program i have been asked to download 'legacy Java SE 6 runtime' How do I do that? More Less MacBook Pro (Retina, 15-inch, Mid 2014), macOS High Sierra (10.13.1).

To select another version of Java, you have to set environmental variables

JAVA_HOME='/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home'

JRE_HOME=$JAVA_HOME/jre

JDK_HOME=$JAVA_HOME

export JRE_HOME

export JDK_HOME

export JAVA_HOME

After running these statements

BradleyRossMacBook:~ bradleyross$ java -version

java version '1.8.0_121'

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Dec 16, 2019 3:57 AM