How to Update a MAC OS X Yosemite,Mavericks,MountinLion,Lion,snow leopard to El Capitian OS X
https://support.apple.com/en-us/HT211683
link to El Capitian
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here are the mac versions in order
Monterey (Newest)
Big Sur
Catalina
Mojave
High Sierra
Sierra
El Capitan
Yosemite
Mavericks
Mountain Lion
Lion
Snow Leopard
Leopard
Tiger
Panther
Jaguar
Puma
Cheetah