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Having trouble upgrading to macOS 10.15

I purchased a used MacBook Air with Sierra 10.13.6 and want to upgrade to 10.15. I cannot however find a download for macOS 10.15. I found an update for Catalina 10.15, however is says I need macOS 10.15 to install it. I am new to Macs, so need a bit of help to get started. I don't see the Software Update option when I click on System Preferences as well.

MacBook Air 13″, macOS 10.13

Posted on Apr 3, 2022 6:43 AM

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Question marked as Top-ranking reply

Posted on Apr 3, 2022 7:00 AM

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.


macOS Catalina 10.15 hardware requirements Is this computer as Listed for Catalina ?


macOS Mojave 10.14 hardware requirements



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.

2 replies
Question marked as Top-ranking reply

Apr 3, 2022 7:00 AM in response to RBowen22

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.


macOS Catalina 10.15 hardware requirements Is this computer as Listed for Catalina ?


macOS Mojave 10.14 hardware requirements



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.

Having trouble upgrading to macOS 10.15

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