One installer. No account, nothing to configure — the media encoder ships inside.
Launch it, pick a source, and press record — or use Ctrl+Shift+R from anywhere. Before every take Screen Crisp re-checks your display, window, microphone, webcam, encoder, folder permissions and free disk space, so a recording either starts clean or tells you exactly what’s wrong. If a session is ever interrupted, the recovery journal offers to repair it on next launch.