choco install xunit -source https://nuget.org/api/v2/ --force -version 2.0.0 -dv

log.sh

2015-03-23 07:20:21,587 [INFO ] - ============================================================
2015-03-23 07:20:21,608 [INFO ] - Chocolatey v0.9.9.2
2015-03-23 07:20:21,614 [DEBUG] - Chocolatey is running on Windows v 6.3.9600.0
2015-03-23 07:20:21,618 [DEBUG] - Attempting to delete file "C:/ProgramData/chocolatey/choco.exe.old".
2015-03-23 07:20:21,621 [DEBUG] - Attempting to delete file "C:\ProgramData\chocolatey\choco.exe.old".
2015-03-23 07:20:21,630 [DEBUG] - Command line: "C:\ProgramData\chocolatey\choco.exe" install xunit -source https://nuget.org/api/v2/ --force -version 2.0.0 -dv
2015-03-23 07:20:21,633 [DEBUG] - Received arguments: install xunit -source https://nuget.org/api/v2/ --force -version 2.0.0 -dv
2015-03-23 07:20:21,663 [DEBUG] - 
NOTE: Hiding sensitive configuration data! Please double and triple 
 check to be sure no sensitive data is shown, especially if copying 
 output to a gist for review.
2015-03-23 07:20:21,674 [DEBUG] - Configuration: CommandName='install'|CacheLocation='D:\System\Temp'|
ContainsLegacyPackageInstalls='True'|
CommandExecutionTimeoutSeconds='2700'|
Sources='https://nuget.org/api/v2/'|Debug='True'|Verbose='True'|
Force='True'|Noop='False'|HelpRequested='False'|RegularOutput='True'|
PromptForConfirmation='True'|AcceptLicense='False'|
AllowUnofficialBuild='False'|Input='xunit'|Version='2.0.0'|
AllVersions='False'|SkipPackageInstallProvider='False'|
PackageNames='xunit'|Prerelease='False'|ForceX86='False'|
OverrideArguments='False'|NotSilent='False'|IgnoreDependencies='False'|
AllowMultipleVersions='False'|ForceDependencies='False'|
Information.PlatformType='Windows'|
Information.PlatformVersion='6.3.9600.0'|
Information.PlatformName='Windows 8.1'|
Information.ChocolateyVersion='0.9.9.2'|
Information.ChocolateyProductVersion='0.9.9.2'|
Information.FullName='choco, Version=0.9.9.2, Culture=neutral, PublicKeyToken=79d02ea9cad655eb'|

Information.Is64Bit='True'|Information.IsInteractive='True'|
Information.IsUserAdministrator='True'|
Information.IsProcessElevated='True'|Features.AutoUninstaller='False'|
Features.CheckSumFiles='True'|ListCommand.LocalOnly='False'|
ListCommand.IncludeRegistryPrograms='False'|
UpgradeCommand.FailOnUnfound='False'|
NewCommand.AutomaticPackage='False'|SourceCommand.Command='unknown'|
FeatureCommand.Command='unknown'|PushCommand.TimeoutInSeconds='0'|
PinCommand.Command='unknown'|
2015-03-23 07:20:21,689 [DEBUG] - _ Chocolatey:ChocolateyInstallCommand - Normal Run Mode _
2015-03-23 07:20:21,696 [INFO ] - Installing the following packages:
2015-03-23 07:20:21,699 [INFO ] - xunit
2015-03-23 07:20:21,702 [INFO ] - By installing you accept licenses for the packages.
2015-03-23 07:20:26,554 [ERROR] - xunit not installed. An error occurred during installation:
 The 'xunit 2.0.0' package requires NuGet client version '2.8.1' or above, but the current NuGet version is '0.9.9.2'.
2015-03-23 07:20:26,568 [DEBUG] - No package information as package is null.
2015-03-23 07:20:26,579 [DEBUG] - No package information to save as package is null.
2015-03-23 07:20:26,586 [ERROR] - xunit install not successful.
2015-03-23 07:20:26,594 [ERROR] - xunit not installed. An error occurred during installation:
 The 'xunit 2.0.0' package requires NuGet client version '2.8.1' or above, but the current NuGet version is '0.9.9.2'.
2015-03-23 07:20:26,611 [WARN ] - 
Chocolatey installed 0/1 package(s). 1 package(s) failed.
 See the log for details.
2015-03-23 07:20:26,618 [ERROR] - Failures:
2015-03-23 07:20:26,626 [ERROR] -  - xunit
2015-03-23 07:20:26,632 [DEBUG] - Exiting with 1