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diff --git a/Technotes/MacSoftwareUpdater.md b/Technotes/MacSoftwareUpdater.md
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--- a/Technotes/MacSoftwareUpdater.md
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@@ -1,12 +1,66 @@
# Mac Software Updater
To make updating the Mac app easy, we're using the [Sparkle framework][1].
This is added to the project via the Swift Package Manager (SPM), but at the time of writing, tagged versions of Sparkle do not yet support
SPM — the dependency can only be added from a branch or commit. To avoid any surprises arising from updates to the project's `master`
branch, we're using [WriteFreely's fork of Sparkle][2]. Updates to the forked repository from upstream should be considered dangerous and
tested thoroughly before merging into `main`.
+WriteFreely for Mac uses the v1.x branch of Sparkle, and is therefore not a sandboxed app.
+
+## Troubleshooting
+
+### If Xcode throws an error when you try to build the project
+
+You may need to reset the package caches:
+
+1. From the **File** menu in Xcode, choose **Swift Packages** → **Reset Package Caches**
+2. Again from the **File** menu, choose **Swift Packages** → **Update to Latest Package Versions**
+
+You should then be able to build and run the Mac target.
+
+### If you can't run `generate_keys` because "Apple cannot check it for malicious software"
+
+There may be a code signing issue with Sparkle. Right-click on `generate_keys` in the Finder and choose Open ([reference][3]).
+
+## Deploying Updates
+
+To [publish an update to the app][5], you'll need the **Sparkle-for-Swift-Package-Manager.zip** [archive][4] — specifically, you'll need the
+`generate_appcast` tool. Download and de-compress the archive.
+
+You will need some credentials and signing certificates to proceed with this process; speak to the project maintainer if you're responsible for
+creating the update, and confirm you have:
+
+- the app's Developer ID Application certificate (check your Mac's system Keychain)
+- the Sparkle EdDSA signing key (again, check your Mac's system Keychain)
+
+Sign and notarize the app archive, then click on **Export Notarized App** in Xcode's Organizer window. Open the Terminal and navigate to
+where you de-compressed the Sparkle-for-Swift-Package-Manager archive, then create a zip file that preserves symlinks:
+
+```bash
+% ditto -c -k --sequesterRsrc --keepParent <source_path_to_app> <zip_destination>
+```
+
+For example, if you export the notarized app to the desktop, all prior updates are located in `~/Developer/WriteFreely/Updates`, and
+the final archive should be called `WFMac.zip`, you would run:
+
+```bash
+% ditto -c -k --sequesterRsrc --keepParent ~/Desktop/WriteFreely\ for\ Mac.app ~/Developer/WriteFreely/Updates/WFMac.zip
+```
+
+Then, generate an appcast file:
+
+```bash
+% ./bin/generate_appcast ~/Developer/WriteFreely/Updates
+```
+
+Once that's done, upload the appcast.xml and WFMac.zip files to the update distribution server (`files.writefreely.org/apps/mac`)
+and they'll be made available to users.
+
<!--references-->
[1]: https://sparkle-project.org
[2]: https://github.com/writefreely/Sparkle
+[3]: https://github.com/sparkle-project/Sparkle/issues/1701#issuecomment-752249920
+[4]: https://github.com/sparkle-project/Sparkle/releases/tag/1.24.0
+[5]: https://sparkle-project.org/documentation/publishing/

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