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how download Mac OS Sonoma for MackBookPro?
MacBook Pro 13″, macOS 13.6
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You can only do so on a Mac which is compatible with Sonoma. Here is an Apple article showing the requirements for macOS Sonoma:
macOS Sonoma is compatible with these computers - Apple Support
On a compatible Mac, you should be able to go into the Software Update section of System Preferences/Settings which should show Sonoma as an option. If your Mac is compatible, but is not showing as an option in Software Update, then you can use a link in the following Apple article to access the Sonoma download:
How to download and install macOS - Apple Support