I need to upgrade to mac os El Capitan

I the webpage on the Apple support gives an option to upgrade - simple clicl and download.

So I wait the one hour for the download "InstallIOS.dmg" no matter where i click on that page it either downloads above or "installXOS.dmg"

either way they either works they are like placebos, and just update the existing os "very Frustration"

I NEED to link to the ACTUAL os upgrade to El Capitan

Better would ne to go direct to Sierra

any help would be greatly appreciated.

Existing OS X Yosemite 10.10.5 2011 mac pro 4gb 133 mhz 2.2 ghz i7 co2g8erdrjd