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upgrading to Big Sur

how to i upgrade my 2015 macbook pro(running Yosemite 10.10.5) to Big sur?

Posted on Dec 9, 2021 3:58 PM

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Question marked as Top-ranking reply

Posted on Dec 9, 2021 9:42 PM

Here are some steps that may help.


  1. Back up your Mac.
  2. Upgrade to macOS Big Sur.
3 replies

Dec 10, 2021 4:52 AM in response to Dsvallade

The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.


With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install.  For Best results use Safari to commence the download as Others may not work.


Safari will open a redirect and open the Apple Store where the download can commence



Tips Big Sir Upgrade Released Nov 2020. Be sure to read about the Empty Space Requirements for the upGrade to Big Sur.



Make Time Machine Backup  is very useful and can be used to Revert to Previous Working macOS


Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina, Big Sur & Monterey supports only 64 bit and there is no workaround.


Suggest using Go64 to find 32 bit application before attempting the upGrade. Some or many of the Application already installed may required update or upGrades to 64 Bit Versions.


Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal  operation of the OS and may even Corrupt the OS requiring a Reinstallation

upgrading to Big Sur

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