how can I update to macOS 10.15?

Back up your data, check the application compatibility table, click here, and if your MacBook Air is a 2012 or newer mode, then on the download link for Catalina.

Catalina and above won't run 32-bit software; use Go64 as well.

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Hi there,

First go to apple logo in menu bar>about this Mac to see your Mac model year

Then, check if your Mac is compatible with Catalina via this link macOS Catalina is compatible with these computers - Apple Support

As i know, macOS 10.15 (Catalina) is not compatible with all vintage Mac models. The compatible Mac models for macOS 10.15 are generally from 2012 or later. If your MacAir is a vintage model, it may not meet the system requirements for macOS 10.15.

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