We highly recommend that you use the new Aerial Companion for install. It will automatically install, and update, your screensaver. You can choose whether updates should happen automatically in the background, or if you prefer to be notified. You can also pick whether you want an icon in the menu bar to notify you or not! And you bet it's open source!

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Making the web more beautiful, fast, and open through great typography. This is generated automatically on my Mac, after Aerial gets notarized for distribution and before I upload a new version on Aerial's releases page. Periodically, Aerial Companion checks the manifest to see if a new version was released. When you decide to perform an update, the following happens.

Installing this way is super easy, the Companion is now available in a more familiar dmg format and it's really just a drag and drop :

Good question!

If you have used Aerial for a while, you may remember that in version 1.5.0, I had introduced an auto-update mechanism directly into the screen saver.

While this worked for a while, Apple introduced changes in how screen savers operate with macOS 10.15 Catalina. Those security changes are good and were needed, but they had the unfortunate consequence of breaking the auto-update mechanism.

While I still patiently wait for a new screen saver API from Apple, in the meantime, I ended up making this new Companion to fill the gap. It also makes the initial installation easier and gives you a quick access to your screen saver settings from the menu bar. And starting with version 1.2, you can also run Aerial fullscreen on one monitor while you keep working on the other one!

An ever better question!

The honest answer would be that there are never any certainty when it comes to security.

Some generalities, both the screen saver and the Companion app are signed and notarized by/with Apple, as its now required. They are signed with my personal Developer Apple ID (Guillaume Louel).

Mac Download Folder

How does it work, technically speaking?

I store a manifest file on GitHub that contains the version number of the latest release, and also the sha256 of the releases. This is generated automatically on my Mac, after Aerial gets notarized for distribution and before I upload a new version on Aerial's releases page.

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Periodically, Aerial Companion checks the manifest to see if a new version was released. When you decide to perform an update, the following happens:

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• Aerial Companion uses the version number from the manifest to infer the download link from Aerial's repository (the download links are always of the same format, so version 1.9.2 will be available at https://github.com/JohnCoates/Aerial/releases/download/v1.9.2/Aerial.saver.zip)
• The zip file is downloaded to ~/Library/Application Support/AerialUpdater/
• The sha256 of the file is computed, and compared to the one from the manifest
• The zip is unzipped in place, looking for Aerial.saver
• Aerial.saver is verified (using macOS codesigning) to be using the correct Bundle ID (com.JohnCoates.Aerial>)
• Aerial.saver is verified (using macOS codesigning) to be signed/notarized with my Developer Apple ID.
• If and only if everything checks out, then Aerial.saver gets copied to ~/Library/Screen Savers/ (a directory that is created if you don't have it). This replaces your old version or install fresh if you didn't have any. At that point, the new version is installed and ready to go!

While nothing is ever perfect, these checks add many layers of security to the classical methods of just downloading a zip from GitHub. If you think this method can be improved further more, please let me know, the code of the Companion and the update system is reviewable and is open source right here on GitHub.

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