Do NOT install kexts to /S/L/E in macOS versions 10.10+. You have two options:
- Install to /L/E and then rebuild cache with
sudo kernelcache -i /
And then restart. Or
- Install this kext to EFI/Clover/kexts/other and restart. Be aware that some kexts don't work properly when injected by Clover and must be installed to /L/E. It's just a matter of trying and seeing which works best for you. I'm currently using this kext installed in Clover without any problems.
You should choose ONLY one option. Do NOT install this kext twice. I recommend installing to /L/E as it is more guaranteed to work. You should be able to fix your problem by running the following in a Terminal window:
sudo cp -R /System/Library/Extensions/ApplePS2SmartTouchPad.kext /Library/Extensions/
sudo rm -rf /System/Library/Extensions/ApplePS2SmartTouchPad.kext
sudo kextcache -i /