Upgrade from Yosemite to El Capitan
I followed the instructions on https://support.apple.com/en-us/HT206886, i. e. I downloaded the file http://updates-http.cdn-apple.com/2019/cert/061-41424-20191024-218af9ec-cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg, unpacked it and clicked for execution. Everything went fine, without any warnings. I rebooted my Mac but it still is Yosemite 10.10.5.
What is wrong?!
iMac, OS X 10.10