I have a 2007 iMac running Snowleopard. The hardware will support Yosemite, however I can't find that on the app store and my hardware will not run the latest OS High Sierra.
I was told El Capitan would run a lot slower. Can I download the upgrade software for Yosemite?

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See apple.stackexchange.com/questions/309399/… You have a choice of one, El Capitan.– TetsujinJan 13 at 7:54

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