Yosemite 10.10.5 not found in apple store

There is no Yosemite in the apple store of my macbook pro so I download Yosemite_ zone.Iso 10.10.5 and copy it to my macbook pro, try to make yosemite bootable usb flash with install disk creator but a message came which say it is lacking the file Content/SharedSupport/installESD.dmg then I convert the Yosemite_zone.iso through disk utility to Yosemite_zone.dmg and try to make bootable USB flash but the same above message