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I'm currently running macOS Mojave (10.14.6) on a 2017 13-inch MacBook Air. I need to upgrade to Catalina to install MySQL.

So, I downloaded Catalina from the App Store but even after freeing up the required space, this dialog comes up... I don't know how to proceed from here.

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Disk Utility:

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  • We need to know precisely what Mac you have - from  Menu > About this Mac Model & year… & if the system won't let you inline the picture, send it to imgur.com & add a link in a comment. Someone can inline it for you.
    – Tetsujin
    Commented Jul 21, 2023 at 18:38
  • @Tetsujin added it
    – The Great Gatsby
    Commented Jul 21, 2023 at 18:43
  • Thanks - but can you do the same with the error message. [btw, it's likely to be 'Purgeable space' which you can see if you look at Disk Utility] See apple.stackexchange.com/a/370809/85275
    – Tetsujin
    Commented Jul 21, 2023 at 18:47
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    You could free up space by creating a bootable Catalina installer on a handy 8GB USB stick. Once the installer is created you can delete the installer from the Mac's hard drive, freeing more space. Macworld has a number of tutorials that can help you do just this.
    – Steve Chambers
    Commented Jul 21, 2023 at 19:18
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    12Gb is barely enough free space for normal running. I'd suggest removing more space before the installer can work. I'd aim for at least 25Gb of free space at a minimum on a 128 Gb disk.
    – benwiggy
    Commented Jul 21, 2023 at 20:42

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