unable to install iTunes in MacBook Air o s above 15

1 - On June 3, 2019, Apple stated that they would no longer include iTunes with future Mac computers. Starting with the operating system macOS Catalina, Apple instead split iTunes into separate apps: Apple Music, Apple TV, and Apple Podcast

2 -OP wrote " I am unable to install my o s sequoia 15.0.1 "

What exactly is the Error Message when you try to update to Sequoia 15.0.1 ?

Have you tried Installing when booted into Safe Mode ?

Catalina and above split the functions of iTunes between several new applications and the Finder; use those instead.

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