无法安装nuget package unity 2

Question

I need to downgrade my app from 4.5 to 3.5 and i had unity 3 installed. Now i cannot install unity 2.1 from nuget, because of this error:

PM> Install-Package Unity -Version 2.1.505.2
The source at nuget.org [https://www.nuget.org/api/v2/] is unreachable. Falling back to NuGet Local Cache at C:\Users\voskresenskiy\AppData\Local\NuGet\Cache
Install-Package : Unable to find version '2.1.505.2' of package 'Unity'.
At line:1 char:16
+ Install-Package <<<<  Unity -Version 2.1.505.2
    + CategoryInfo          : NotSpecified: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

What am i doing wrong? I'll be gratefull for any help

Answer 1

It seems your internet connection ist down or the Nuget Org is temporary not reachable, and the desired version of Unity is not avilable in the cache.

Take alook at this :

Though NuGet packages are typically consumed from a remote gallery such as the NuGet gallery using a network connection, there are many scenarios where the client is not connected. Without a network connection, the NuGet client was not able to successfully install packages - even when those packages were already on the client's machine in the local NuGet cache. NuGet 2.8 adds automatic cache fallback to the package manager console. For example, when disconnecting the network adapter and installing jQuery, the console shows the following:

PM> Install-Package jquery The source at nuget.org [https://www.nuget.org/api/v2/] is unreachable. Falling back to NuGet Local Cache at C:\\Users\\me\\AppData\\Local\\NuGet\\Cache Installing 'jQuery 2.0.3'. Successfully installed 'jQuery 2.0.3'. Adding 'jQuery 2.0.3' to WebApplication18. Successfully added 'jQuery 2.0.3' to WebApplication18.

EDIT:

After testing the same command i can confirm it works fine, using the same version i could install it using nuget, check the settings of nuget and ensure the nuget.org is check as package source.