@Russ I got the same error after uninstalling and then attempting to reinstall this morning. I'll restart and give it another go. I took a look at the log but I can't copypasta it on there due to length.
Let me paste a couple entries that caught my eye in terms of the failed install:
2020-04-24 09:14:11> Program: Starting Squirrel Updater: --install .
2020-04-24 09:14:11> Program: Starting install, writing to C:\Users\kadamson\AppData\Local\SquirrelTemp
2020-04-24 09:14:11> Program: About to install to: C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent
2020-04-24 09:14:11> Program: Install path C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent already exists, burning it to the ground
2020-04-24 09:14:12> Utility: DeleteDirectory: could not delete - C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent\app-1.0.22\resources\app\src: System.IO.IOException: The process cannot access the file 'C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent\app-1.0.22\resources\app\src' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound, WIN32_FIND_DATA& data)
at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
at Squirrel.Utility.<DeleteDirectory>d__19.MoveNext()
2020-04-24 09:14:13> Utility: DeleteDirectory: could not delete - C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent\app-1.0.22\resources\app: System.IO.IOException: The directory is not empty.
2021-03-05 09:04:01> Program: Starting install, writing to C:\Users\kadamson\AppData\Local\SquirrelTemp
2021-03-05 09:04:01> Program: About to install to: C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent
2021-03-05 09:04:01> Program: Install path C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent already exists, burning it to the ground
2021-03-05 09:04:01> IEnableLogger: Failed to remove existing directory on full install, is the app still running???: System.UnauthorizedAccessException: Access to the path 'C:\Users\kadamson\AppData\Local\TRIGGERcmdAgent\app-1.0.25\resources\app\src\node.exe' is denied.
Win10 64. 20H2. Running as a full admin and also use "Run as admin". AV is Windows Defender.
One question I did have. What is going on with the Discord, Teams, Whatsapp stuff that I'm seeing in the log? What are you doing in these folders?
3912> 2020-03-12 16:59:13> Program: About to install to: C:\Users\kadamson\AppData\Local\Discord why is it installing in the Discord AppData folder?