Unable to download the Yosemite.

I am unable download OS Yosemeite. An error occurs at the time of download. What is the solution

Hi ..
Several things to try ...
   Disable anti virus software if installed
   Check your settings in System Preferences > Security & Privacy > Firewall > Firewall Options
   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.
OS X: About Gatekeeper
Yosemite requries 5.16GB's of storage space so make sure there's sufficent space available.
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.

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