macOS Catalina is said to have dropped support for 32-bit apps. It’s not clear how much support is dropped.
Is there any supported way for a 64-bit app to request the kernel to create a 32-bit code segment?
MacOS – How much of 32-bit support is dropped in macOS Catalina
32-bitcatalinamacos
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Best Answer
netkas has experimented with this here. It seems like Apple has not removed 32-bit capability from the Darwin kernel itself, but merely disabled it as well as removing all the 32-bit libraries from the system.
To re-enable 32-bit processing from the kernel, just disable Apple's disabling function by adding
no32exec=0to your boot-args (sudo nvram boot-args="no32exec=0"if SIP is disabled, if not run the same command from Recovery mode).To get the 32-bit libraries back, just copy them from Mojave
Sources: Bringing back 32-bit apps to life