You right, convert EA from MT4 to MT5 it's piece of cake.
But my MT5 terminal can’t load 'ZorroMT4.ex4', because it is not 64-bit version.
Update. I setup test Win 10 Pro x86 virtual machine with x86 MT5 version and have got the same mistirious error message "ZorroMT4.ex4 is not 32-bit version. Cannot load ZorroMT4.ex4"