- Disable anti virus software if installed
- Make sure the firewall is turned off in System Preferences > Security & Privacy > Firewall
- Make sure Gatekeeper is enabled
Open System Preferences > Security & Privacy then select the General tab.
Make sure either Mac App Store or Mac App Store and identified developers is selected. If that area is grayed out, click the padlock icon to proceed.
I have the same problem although I have more information about the error. It only occurs when I reach 995-996 mb of download. I've turned off anti-virus software. I've deleted the download and started from scratch. I've made sure Gatekeeper is enabled.
It doesn't matter what, when I hit 996 mb it errors out and tells me to re-purchase Mavericks.
Got any other ideas?
Mavericks requires a broadband internet connection.
Check your download speed here > Speedtest.net - The Global Broadband Speed
Anything less than 10Mbps and you may not be able to download Mavericks. And keep in mind, if you should need to repair the startup disk or restore OS X, that requries a broadband connection as noted here > OS X Recovery
Mavericks requires at the least, 8GB's of storage space.
Click your Apple menu top left in your screen. From the drop down menu click About This Mac > More Info > Storage
Make sure there's at least 15% free disk space.