I suggest you remove JMRI and any existing JAVA versions. Load Azul Java 8 and then JMRI 4.26. Run it. Then you can do the upgrades per instructions. Changes happen to the panels that prevent you from jumping them right into JMRI 5.x.
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Ken
NYNH&H, Old Colony Division, Cape Cod Branch (1949-1959)
Loconet * JMRI 5.9.3 * OSX,Win10,Ubuntu
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Ken Heywood