can not install Maverick
I have successfully downloaded Maverick.
But when I clicked on 'install' I got the message: Can not install on HD MacIntosh because that drive is used for Time Machine.
[Actually I have Time Machine set to use an external hard drive.]
So I used System Preferences to simply turn off Time Machine.
Then I tried to again to install Maverick.
This time I simply got the message "Can not install Maverick on HD MacIntosh.
With no way to determine why, at least none I could figure.
iMac, OS X Mountain Lion