how can i upgrade macbook pro (15-inch, Mid 2010) from Yosemite to Sierra 10.12
Please help, how can i upgrade my Macbook Pro (15-inch, Mid 2010) from Yosemite to Sierra 10.12 since i am unable to use thunderbird and bitanami Wordpress
MacBook Pro
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Suggest you consider High Sierra 10.13 instead. It is a very stable macOS release and the highest your computer can run.
You can find Apple links to old versions of Mac system software in this support document:
How to get old versions of macOS - Apple Support
Be sure to use Safari for any downloads—FireFox is not working for these files for some unknown reason.
⚠️ Always completely back up your hard drive to an external device before ANY system upgrade.