Can't upgrade to MacOs 10.10
HELP PLEASE!
I have a Macbook Air Mid 2011 that runs on MacOs 10.9.5
I have been trying to upgrade it to MacOs X Yosemite and it always says that the installation was successful but after restarting it, it was still MacOS 10.9
I also tried contacting Apple Support but since this Macbook is vintage, we already exhausted what he knows can help me.
I also tried repairing the drive/device and it's okay. I have more than enough storage available. I also tried reinstalling OS X using Disk Utility but I keep receiving a pop-up message "A download is missing".
I just want to at least update it to 10.10
Please help me 🙏
MacBook Air