My 2020 Mac can’t upgrade to new OS
How to free up space to upgrade OS
MacBook Pro 13″, macOS 10.15
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Whatisit2020 wrote:
How to free up space to upgrade OS
Big Sur—Press release states that you will need 35.5 GB of free storage when upgrading from High Sierra or newer, and 44.5 GB when upgrading from an older versions.
Empty your Trash — Delete files and folders on Mac - Apple Support
https://support.apple.com/guide/mac-help/delete-files-and-folders-on-mac-mchlp1093/mac
How to free up storage space on your Mac - Apple Support
https://support.apple.com/en-us/HT206996
See used and available storage space on your Mac
User tip: "Other and What Can I Do About It ?"
https://discussions.apple.com/docs/DOC-5142
If necessary Thin local snapshots :
ref: https://eclecticlight.co/2020/04/09/where-did-all-that-free-space-go-on-my-apfs-disk/
Try something like OmniDiskSweeper for a GUI to get a good look at itemized file size and location:
OmniDiskSweeper http://www.omnigroup.com/more