open Source/Soundflower.xcodeproj- Hit
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Disable System Integrity Protection. Reset to recovery (hold Command+R while loading). Menu -> Utilities -> Terminal:
csrutil disable
Then reboot, go to console. Allow loading kext from any location:
systemextensionsctl developer on
Unload and remove old build (if any)
sudo kextload -v /tmp/Soundflower.kext
sudo rm -R /tmp/Soundflower.kext
Copy and load new one
sudo cp -R Build/InstallerRoot/Library/Extensions/Soundflower.kext /tmp
sudo kextload -v /tmp/Soundflower.kext
Mount / in RW-mode
sudo spctl --master-disable
sudo mount -uw
sudo killall Finder
Copy to /System/Library/Extensions (NOT UNDER MC!)
sudo cp -r /tmp/Soundflower.kext /Library/Extensions
Reboot? Profit!
Show kernel logs (useful to see CoreAudio output):
log stream --process 0
IOLog. For some reason messages are corrupted :(
log show --predicate 'senderImagePath CONTAINS "Soundflower"'
http://www.alauda.ro/2013/12/iouserclient-and-ioexternalmethod/