If you’re still not able to install, and if you have Yosemite or earlier, see the Apple support article
on how to repair your disk permissions.
Visit the Apple support site to learn how to start your Mac in Safe Mode. This may help you to
pinpoint the problem.
+Device disconnects or keeps losing Bluetooth connection
Likely Cause(s):
Low battery levels
Plugging the receiver into a USB hub or other unsupported device such as a
KVM switch
NOTE: Your receiver must be plugged directly into your computer.
Using your wireless device on metal surfaces
Radio frequency (RF) interference from other sources, such as wireless speakers, cell phone, and
so on
Symptom(s):
Bluetooth connection keeps dropping
The device doesn’t connect to Bluetooth
Button/cursor lagging
Possible solutions:
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