An error has occurred when trying to download Mavericks from the AppStore, why?

Question

I have an update available from the appstore to upgrade from my OS X Lion 10.7.5 to OS X Mavericks, but every time i click on the free upgrade button i get a message on the side of it that says an error has occured. Yet it does say what type of error. And i see it in the launch pad and it says "waiting". How do i fix this?
I have a iMac from mid 2011 with 4bg of mem, 2.7 GHZ intel core processor i5, and graphics AMD Radeon HD 6770M 512MB.
Can someone help me out here?
-Sebastian

Answer 1

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.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
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. Anonymize before posting.