You purchase it as a digital download or physical media from authorized resellers:
Since Hyperion Entertainment released the update in 2021, it is sold as a digital download or on CD-ROM (which includes the ADF floppy disk images). amiga os 3.2 download
(official publisher) – direct download after purchase → https://www.hyperion-entertainment.com You purchase it as a digital download or
Last updated: October 2024. Always check for OS 3.2.2 or 3.2.3 updates after your initial installation via the official AmigaOS Update tool. amiga os 3.2 download
Simply put: If you are still running OS 3.1, you are missing out on 20+ years of polish.