Archiving all Rosetta 2 installers

With Rosetta 2 support winding down, time to revisit offline installer backups (Apple’s legacy software availability notwithstanding).

This update covers batch downloading RosettaUpdateAuto.pkg for all macOS versions from 11 through 26 beta, comprising 472 files totaling just under 150MB.

  1. Install Python (python3 will trigger installation if necessary) and requests (pip3 install requests)

  2. Run the following script1 to:

    • download all Rosetta 2 PKGs from Apple to ./RosettaUpdates/ (skipping existing files),
    • organize PKGs by macOS version, and
    • generate a timestamped report (rosetta_recommendation_date_time.txt in the current directory) recommending the latest versions by PostDate.2

Footnotes

  1. H/T: Kagi's Code Assistant & ChatGPT integration along with Google Gemini

  2. Some PKG versions have an older PostDate but contain newer files internally, such as with macOS 11.3:

    Filename PostDate Newest file
    001-29948_RosettaUpdateAuto.pkg 2021-04-26 2021-02-28
    071-29199_RosettaUpdateAuto.pkg 2021-04-20 2021-02-28
    071-27946_RosettaUpdateAuto.pkg 2021-04-13 2021-03-25
    071-26758_RosettaUpdateAuto.pkg 2021-04-08 2021-03-25
    071-21342_RosettaUpdateAuto.pkg 2021-03-31 2021-03-25
    071-20136_RosettaUpdateAuto.pkg 2021-03-23 2021-03-03
    071-17606_RosettaUpdateAuto.pkg 2021-03-15 2021-03-03
    071-08922_RosettaUpdateAuto.pkg 2021-03-02 2021-02-24
    071-07131_RosettaUpdateAuto.pkg 2021-02-18 2021-02-10
    071-05229_RosettaUpdateAuto.pkg 2021-02-17 2021-02-10
    071-02780_RosettaUpdateAuto.pkg 2021-02-02 2021-01-22

❧ 2025-06-09