use this command to make a file executable: sudo chmod -R 755 <file or folder>
this command sets the ownership to root and the group to wheel: sudo chown -R root:wheel <file or folder>.
This is quite important if you copy over some file manually. Kexts/drivers will not load, if there access rights are wrong. All other files need to have the correct rights to run properly.
Look in your private message box for the kext.