Zenith Grabber supports automatic updates: so to keep things organized, the download available on Itch.io is just an updater/downloader.

Part 1) Initial download

Once you've downloaded the installer, extract everything into a folder. Run "Zenith Updater.exe" to begin downloading the latest version. Once completed, you will find a new directory inside your update folder called "Zenith Grabber" which includes the actual program. The updater will automatically launch Zenith Grabber once finished.

Part 2) Updating an out-of-date client

When launching Zenith Grabber you might notice a "!" icon displayed over your settings. This means that your client is out-of-date.
Click on the settings tab and at the top, you will see an "UPDATE" button. Click on it to start the download. Once it's finished downloading, the update will be installed and Zenith Grabber will re-launch.