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With the release of Dynamics 365 (online), version 9.0, there are a lot of changes in our developer documentation:
No more monolithic SDK download : Getting the assemblies and tools you need
SDK assemblies and tools will be distributed only via NuGet. We will provide a script that will allow you to download the assemblies and tools from NuGet.

You can follow below steps to download Nuget Packages using Visual studio

Step 1 Right Click on to your visual studio project and click on to manage NuGet Packages


Step 2 Search for "Microsoft.CrmSdk.XrmTooling.PluginRegistrationTool" and click on install


Click on I accept


Step 3 Navigate to the package directory of that project


Step 4 Search the folder Microsoft.CrmSdk.XrmTooling.PluginRegistrationTool.X.0.0.X



Done!! now you will be having your latest Plugin registration Tool

Sample PRT Reference for quick start  : Microsoft.CrmSdk.XrmTooling.PluginRegistrationTool.9.0.0.7

In the same way you can download any of the NuGet assemblies and tools

Hope it helps !!

Happy CRMing


SOURCE : mscrm.com