I want to update my MacBook I can't download any thing
my Macbook pro is version 10.13.6 and want to update it to the new version
MacBook Pro 13″, macOS 10.13
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You need also to state the year of your Mac. Your Mac might not support a later operating system, which would account for why you are not being offered an upgrade to a later system.
A MacBook Pro from 2012, for example, can install Catalina (10.15), but the last macOS a 2011 MacBook Pro supports is 10.13 High Sierra.
A 2017 MacBook Pro will support the current macOS - Monterey.