Replace guessed CDN URL with the real API endpoint: https://api.prod.kyber.gg/download/kyber-installer-win64.zip The download is a zip, so extract the .exe before passing it to Proton. Requires unzip (standard on Ubuntu). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01D8ckUJQtj1pH8jtAddBDZs