I was trying to upgrade to OSX 10.9 but during the upgrade when the download got to 2.6gb /5.29gb message "an error occurred" appeared and since then i have been un able to upgrade, what can i do.

I was trying to upgrade to OSX 10.9 but during the upgrade when the download got to 2.6gb /5.29gb message "an error occurred" appeared and since then i have been un able to upgrade, what can i do.

If you purchased Lion for your iMac, just log into the Mac App Store from your MacBook using the Apple ID under which you purchased Lion and go to the Purchases page. You will be able to download and install Lion there. 
searching the internet i found a link to upgrtade to 10.7
The only place you get get Lion is from the Mac App Store. If you found some other site, that was an illegal copy and almost certainly tied to someone else's Apple ID and hence unusable by you. If the link was just to the Mac App Store, see above.
As to the problem with synchronization to iCloud, that's not a 10.6 question, so I'd suggest you take up that specific issue in either the Lion or iCloud forums, providing full details, and someone there can probably help you sort things out.
Regards.

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