How to Install Raspberry Pi OS (Legacy)
Every so often, the Raspberry Pi Foundation releases a new version of the Raspberry Pi OS. With new operating system versions come changes—we remember when it was called Raspbian instead of Raspberry Pi OS. But with these updates comes new system configurations that can cause unexpected issues with existing projects, programs, and applications.
Many makers are hesitant to upgrade their operating system, preferring to maintain functional operation at the cost of using an out of date OS. The Raspberry Pi Foundation has recognized this problem and addressed the matter with the release of a legacy edition of the Raspberry Pi OS based on the Debian Buster release.
This officially supported OS edition is available for install on the official Raspberry Pi website. Users have two ways of getting the legacy edition including a manual download option or through the Raspberry Pi Imager.