Construct 3 is designed to work without an internet connection once it has been loaded for the first time.
Once cached, you can revisit the URL (or use your desktop shortcut) to continue working. how to download construct 3 for free
Open the Construct 3 editor in Google Chrome. Go to the browser menu (three dots) > More tools > Create shortcut (or "Install Construct 3"). This adds a shortcut to your desktop or shelf that opens the engine in a dedicated window without a URL bar. Construct 3 is designed to work without an
While Construct 3 is web-based, you can still install it as a desktop or mobile app for better performance and easier access: how to download construct 3 for free
About Construct 3 free version limitations (and it's popularity)