https://www.elevenforum.com/t/latest-logitech-logi-options.8003/

Logi Options+ refuse de se lancer ce matin. Si vous ouvrez l’app de Logitech destinée à configurer ses souris et clavier, vous verrez le fond violet, l’animation de chargement habituelle et… c’est tout. Le reste de l’interface ne s’affiche pas et s...
Anyone else on macOS #Tahoe (26.2) notice today that your Logitech mouse/hardware stopped working as expected? #Logitech pushed out a broken #LogiOptionsPlus update. To fix, reinstall version 1.44.415778 (link below from LogiTech) and TURN OFF AUTO UPDATES.
See first reply below for instructions on how to completely uninstall the broken LogiOptions (and restart) before installing the old working version.
Link to working LogiOptions: https://download01.logi.com/web/ftp/pub/techsupport/optionsplus/logioptionsplus_installer_1.44.415778.zip