Clear your browser cache. The PWA service worker may be holding onto old assets. Hard refresh: Ctrl+Shift+R (Windows/Linux) or Cmd+Shift+R (Mac). Then go to chrome://serviceworker-internals/ (or equivalent for your browser) and unregister any SilverBullet workers.
If they match, your download is authentic and uncorrupted. download silverbullet 114 updated
Run it:
Make the file executable (Linux/macOS):