Why can I download but not install Mavericks?

My Macbook Air will download 5 programs associated with Mavericks but will not install them.  I get an error message that reads, "unable to install due to unexpected error".   Help please!

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Select
/var/log ▹ install.log
from the hierarchical list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar. Then select the messages from the last installation or update attempt, starting from the time when you initiated it. If you're not sure when that was, click the Clear Display button in the toolbar of the Console window and then try the installation again.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message (command-V).
If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. Don't post more than is requested.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Edit it out by search-and-replace in a text editor before posting.

Similar Messages

  • I want to download, but not install Mavericks.

    I am not quite ready to upgrade to Mavericks, but would like to download it and not install it.  I might install it on an external drive first, if that is possible.  It appears to be a 3.5 hour download for me.  Can I just start the download process and leave it?  I am afraid it will automatically install if I don't catch it at the end of the download process.  Thanks!
    iMac  10.6.8

    The 10.9.3 version of the installer is version 1.3.42. Use, "More Info'" Cmd-I to see that. If that is what you have, re-downloading should replace the previous one with the newer version.
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    Thanks for your reply Eric
    Can't help wondering thought, people are ok with this?
    Basically Apple are saying: "Do not attempt to install an older version of OSX which came preinstalled. If so, expect multiple failures." Really?! Has it always been so? For me it's not like I'm going to install Snow Leopard on my Late 2013 Retina MBP, but I would expect some form of backward compatibility between the previous version and it successor. Apparently this is not possible, and how is this even acceptable? 
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    I find this quite disturbing actually, and please tell me it's not so. There gotta be a way to do this?
    I simply want to download the OS but I expect some registry values (like windows' registry) keeps preventing this.
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