10.7.4 を実行している MacBook Pro 2011 に Xamarin をインストールしようとしています。インストーラーを実行すると、最初に Android SDK のインストールが試行されますが、しばらくすると失敗し、エラー レポートには次のように表示されます。
Error downloading from Google server. Android SDK.
The operation has timed out.
Exception type: System.Net.WebException
Message: The operation has timed out.
at System.Net.WebConnectionStream.Read (System.Byte[] buffer, Int32 offset, Int32 size) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.DownloadService.DoDownload (Int64 totalBytes, System.IO.Stream responseStream, System.IO.Stream outputStream, System.Object state) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.Utilities.DownloadUrl (System.Net.HttpWebResponse response, System.String url, System.Action`4 doDownload, Boolean noCache, System.Object state) [0x00000] in <filename unknown>:0
Android SDK installation failed with more than one exception (Attempt #Android SDK)
Some installation errors are present.
Exception type: System.AggregateException
Message: Some installation errors are present.
Exception type: Xamarin.Web.Installer.InstallException
Message: Download failed.
at Xamarin.Web.Installer.Installer.BaseSoftwareItem.ValidateDownloadItem () [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.Installer.AndroidSoftwareItem.Install (UInt32 tryNumber) [0x00000] in <filename unknown>:0
at MacInstaller.WizardPageInstallationController.InstallationWorker () [0x00000] in <filename unknown>:0
Exception type: System.Net.WebException
Message: The operation has timed out.
at System.Net.WebConnectionStream.Read (System.Byte[] buffer, Int32 offset, Int32 size) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.DownloadService.DoDownload (Int64 totalBytes, System.IO.Stream responseStream, System.IO.Stream outputStream, System.Object state) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.Utilities.DownloadUrl (System.Net.HttpWebResponse response, System.String url, System.Action`4 doDownload, Boolean noCache, System.Object state) [0x00000] in <filename unknown>:0
Exception type: Xamarin.Web.Installer.InstallException
Message: Download failed.
at Xamarin.Web.Installer.Installer.BaseSoftwareItem.ValidateDownloadItem () [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.Installer.AndroidSoftwareItem.Install (UInt32 tryNumber) [0x00000] in <filename unknown>:0
at MacInstaller.WizardPageInstallationController.InstallationWorker () [0x00000] in <filename unknown>:0
Exception type: System.Net.WebException
Message: The operation has timed out.
at System.Net.WebConnectionStream.Read (System.Byte[] buffer, Int32 offset, Int32 size) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.DownloadService.DoDownload (Int64 totalBytes, System.IO.Stream responseStream, System.IO.Stream outputStream, System.Object state) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.Utilities.DownloadUrl (System.Net.HttpWebResponse response, System.String url, System.Action`4 doDownload, Boolean noCache, System.Object state) [0x00000] in <filename unknown>:0
Exception type: Xamarin.Web.Installer.InstallException
Message: Download failed.
at Xamarin.Web.Installer.Installer.BaseSoftwareItem.ValidateDownloadItem () [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.Installer.AndroidSoftwareItem.Install (UInt32 tryNumber) [0x00000] in <filename unknown>:0
at MacInstaller.WizardPageInstallationController.InstallationWorker () [0x00000] in <filename unknown>:0
Exception type: System.Net.WebException
Message: The operation has timed out.
at System.Net.WebConnectionStream.Read (System.Byte[] buffer, Int32 offset, Int32 size) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.DownloadService.DoDownload (Int64 totalBytes, System.IO.Stream responseStream, System.IO.Stream outputStream, System.Object state) [0x00000] in <filename unknown>:0
at Xamarin.Web.Installer.Utilities.DownloadUrl (System.Net.HttpWebResponse response, System.String url, System.Action`4 doDownload, Boolean noCache, System.Object state) [0x00000] in <filename unknown>:0
どうしたの？