: This houses your purchased movies, TV shows, and the Apple TV+ subscription service.

Purchases of music, movies, and TV shows are still available, but split across the three apps. For example, buying a song opens Music → Store tab; buying a film opens TV → Store.

Can I download iTunes on macOS Big Sur? - Apple Support Community

: You now perform local backups and software restores through the General tab in the device's Finder menu. ⚠️ Unofficial Workarounds

Starting with macOS Catalina (10.15) and continuing through Big Sur, Apple retired the all-in-one iTunes app and split its functionality into several dedicated apps. If you are looking for your music library, movie collection, or device management tools on Big Sur 11.7, here is where to find them: 1. Where Your Content Went