Do I have to have OS X Mavericks before I can download Yosemite?

I have a Mac Book and recently tried to upgrade to Yosemite and after 3 days of downloading it said that it could not. There was sufficient memory on my laptop so not sure why it would not download.
Do I have to have OS X Maverick installed before Yosemite can download?

How much hard drive space is free? You need 8 GB or more of available space.

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