I downloaded the Linux 64Bit package, unpacked it and went into the directory to run it. Here is what the results were in Terminal:
</> pi@raspberrypi:~/processing-3.5.4 ./processing
pi@raspberrypi:~/processing-3.5.4 -Djava.ext.dirs=/home/pi/processing-3.5.4/java/lib/ext is not supported. Use -classpath instead.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
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Is there a Java install that I need to do?
or a path statement like in (ugh) Windows? I have no clue
For 64 bit raspberrypi I recommend using processing 4, although it still has an issue with the wrong java but is is easily fixed. (aarch64 is not the same as 64 bit linux!!!)