Incompatible Iris after auto-update

After not playing for a while I reopened my game and Distant Horizons said it had auto-updated and would be applied on next launch. I ignored it and finished my session, and have just come back to it today to find that the update broke my 1.20.4 installation. I cannot find a >1.7.2 stable Iris build, and when I try to reinstall the newest stable DH build it re-updates on launch. Is there an Iris build that I missed or some setting I need to change in my config for DH before I launch? Any help will be appreciated.
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