Macbook update
My macbook pro is not updating at alll and will not download Bur Sur. i just the macbook less than 2 years ago.
MacBook Pro 13″, macOS 10.13
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If your computer IS on this list - it should Qualify for the Big Sur UpGrade. macOS Big Sur is compatible with these computers .
How to upgrade to macOS Big Sur and Special Attention to Empty Disk Space Requirements. Then Read this Link Also Before Attempting the Big Sur UpGrade. There is useful information to help with the UpGrade.
If it does Not Apple on that list - it does not Qualify for Big Sur.
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. Make sure to use Only Safari to commence the download as Other may not work
Make a Time Machine Backup Before attempting. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina and Big Sur Only support 64 bit and there is not workaround.
Are there any AntiVirus, Disk Cleaner, Optimizers, Defrag, VPNs 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.