I have updates set to nightly and have not had an issue. For some reason the 12/24 update keeps failing. Log entries:

System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: The handshake failed due to an unexpected packet format. at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult) at System.Net.TlsStream.CallProcessAuthentication(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result) at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size) at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size) at System.Net.ConnectStream.WriteHeaders(Boolean async) --- End of inner exception stack trace --- at System.Net.WebClient.DownloadFile(Uri address, String fileName) at System.Net.WebClient.DownloadFile(String address, String fileName) at NzbDrone.Common.Http.HttpClient.DownloadFile(String url, String fileName) in C:\projects\radarr-usby1\src\NzbDrone.Common\Http\HttpClient.cs:line 238 at NzbDrone.Core.Update.InstallUpdateService.InstallUpdate(UpdatePackage updatePackage) in C:\projects\radarr-usby1\src\NzbDrone.Core\Update\InstallUpdateService.cs:line 102 at NzbDrone.Core.Update.InstallUpdateService.Execute(ApplicationUpdateCommand message) in C:\projects\radarr-usby1\src\NzbDrone.Core\Update\InstallUpdateService.cs:line 215 at NzbDrone.Core.Messaging.Commands.CommandExecutor.ExecuteCommand[TCommand](TCommand command, CommandModel commandModel) in C:\projects\radarr-usby1\src\NzbDrone.Core\Messaging\Commands\CommandExecutor.cs:line 93 at CallSite.Target(Closure , CallSite , CommandExecutor , Object , CommandModel ) at System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid3[T0,T1,T2](CallSite site, T0 arg0, T1 arg1, T2 arg2) at CallSite.Target(Closure , CallSite , CommandExecutor , Object , CommandModel ) at NzbDrone.Core.Messaging.Commands.CommandExecutor.ExecuteCommands() in C:\projects\radarr-usby1\src\NzbDrone.Core\Messaging\Commands\CommandExecutor.cs:line 43 Radarr Ver. 0.2.0.1281 nightly

Failed to get response from: https://ci.appveyor.com/api/buildjobs/69qwy8oxx3behlet/artifacts/_artifacts/Radarr.develop.0.2.0.1284.windows.zip The underlying connection was closed: An unexpected error occurred on a send.