Macbook pro

kristijan82 Said:

"Macbook pro: How can i change from high sierra to big sur i have a old macbook"

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First, find the model of your Mac:

1. Go to: Apple menu
2. Select: About This Mac
3. View: Second line-down

then...

See if the model is seen here: macOS Big Sur is Compatible with these Computers - Apple Support

Follow advise of previous posting . If this computer is too old 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 Others 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 Only support 64 bit and there is no workaround.

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