I can't find anywhere to download Yosemite 10.10.0. Can someone please provide a link for the downloader?

Click here and download El Capitan from the Mac App Store. If you get told that it's incompatible with your computer or you're going to stop upgrading at Lion, choose About this Mac from the Apple menu, check if the computer has at least a Core 2 Duo CPU(Xeon Macs are compatible, but Core Duo ones aren't) and 2GB of RAM, and if it does, order a download code.

Back up your data and check your applications for compatibility before upgrading. In particular, Mac OS X 10.7 and newer don't support PowerPC programs such as versions of Microsoft Office prior to 2008.

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If your Mac is compatible, your nearest, “local” Apple Store should be able to get you Yosemite to install on your Mac.

You may have to bring your Mac with you or provide some other external storage means for Apple employees to install Yosemite into.