Chrome
Download, then paste
Unzip, then in Chrome open Extensions, turn on Developer mode, and load that folder. Paste your key. Tap Ctrl twice on any page to show or hide the capture card. Click a recent capture to edit it in place (saves as you type). Right-click a page to save it as Markdown, pick a highlighted section, or save the link and summary. When a newer build ships, open the popup and click Update — it downloads into that folder, replaces files, and reloads (first time you pick the load folder once).