CoderVPN Unsigned

Start in Vpn.Service/Downloader.cs at AuthenticodeDownloadValidator.ValidateAsync around line 70, then trace the download path through CombinationDownloadValidator and DownloadTask. Reproduce the CoderVPN startup failure and inspect why the downloaded tunnel binary is unsigned. Done means the expected download passes validation and VPN startup no longer reports the Authenticode validation error.

Failed to start CoderVPN: Failed to start VPN. Service reported failure: System.Net.Http.HttpRequestException: Downloaded file failed validation
---> System.Exception: File is not signed and trusted with an Authenticode signature: State=Unsigned, StateReason=None
at Coder.Desktop.Vpn.Service.AuthenticodeDownloadValidator.ValidateAsync(String path, CancellationToken ct) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Downloader.cs:line 70
at Coder.Desktop.Vpn.Service.CombinationDownloadValidator.ValidateAsync(String path, CancellationToken ct) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Downloader.cs:line 252
at Coder.Desktop.Vpn.Service.DownloadTask.Download(HttpResponseMessage res, CancellationToken ct) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Downloader.cs:line 519
--- End of inner exception stack trace ---
at Coder.Desktop.Vpn.Service.DownloadTask.Download(HttpResponseMessage res, CancellationToken ct) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Downloader.cs:line 525
at Coder.Desktop.Vpn.Service.DownloadTask.Start(CancellationToken ct) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Downloader.cs:line 468
at Coder.Desktop.Vpn.Service.Downloader.<>c__DisplayClass3_0.b__1(Task tsk) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Downloader.cs:line 303
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
at Coder.Desktop.Vpn.Service.Manager.DownloadTunnelBinaryAsync(String baseUrl, SemVersion expectedVersion, CancellationToken ct) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Manager.cs:line 496
at Coder.Desktop.Vpn.Service.Manager.HandleClientMessageStart(ClientMessage message, CancellationToken ct) in C:\a\coder-desktop-windows\coder-desktop-windows\Vpn.Service\Manager.cs:line 161