OS X Yosemite not compatible for updates
What does Mac OS 10 mean? - Quora Apple made several versions of their operating system Mac OS, leading up to Mac OS 8, then Mac OS 9, and the next major version would have been Mac OS 10. However, when the change from OS 9 was made to the totally rebuilt, UNIX-based, all-new OS os x yosemite 10.10.5 - Apple Community Sep 27, 2015 OS X 10.10.5 on MacRumors OS X 10.10.5 is being released to the public after two developer betas and one month of testing. The OS X 10.10.5 update can be downloaded through the Software Update mechanism in the Mac App Store. OS X Yosemite - Simple English Wikipedia, the free
Easily check which versions of mac OS, iOS, iPadOS, or watchOS are compatible with your Mac model or iDevice. Guide includes OS X 10.8.x to macOS 11.0.x. Apple OS X Yosemite 10.10.1 Review | PCMag Nov 19, 2014
Download OS X El Capitan 10.11.1 Update
Jun 27, 2019 OS X 10.10 Yosemite review | TechRadar Apr 26, 2016