Tried to install Mavericks but installation froze.  I tried to go back and click on install button but nothing happens. How can I get Mavericks to install?  I have OSX 10.7.5 currently.

How can

Check the App Store Purchases tab to see what shows there - it may be paused.
So how do I get another copy of the installer as the install button for mavericks doesn't do anything when I click it?
Download the installer again.
You can try booting into the Safe Mode using your normal account and see if the installer will run there.  Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don't do them all at once.
Safe Mode - Mavericks
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