SharpDevelop 4.3.3 has been updated to use NuGet 2.7 and now has support for restoring NuGet packages.
Restoring NuGet Packages
To restore NuGet packages for your solution, from the Projects window right click the solution, project or References, and select Restore NuGet Packages.
This will run NuGet.exe and uses the new restore argument that has been added to NuGet 2.7. The full command line will be similar to the following:
NuGet.exe restore YourSolution.sln
The output from this command will be shown in the Output window. In the screenshot below you can see jQuery, Json.NET, Modernizr and NUnit being restored.