I don't think NuGet will help you here. Json.NET removed support for the .NET 3.5 Compact Framework in release 4.0.1, as is stated in the 4.0.1 release notes:
Other major changes in this release are two new builds and the removal of an existing build. Removed is Compact Framework. VS2010 no longer supports Compact Framework so 3.5 r8 will be its last release if you are targeting the Compact Framework.
The most recent version of Json.NET that does support it is 3.5.8, which you can download manually from here:
https://github.com/JamesNK/Newtonsoft.Json/releases/download/3.5.8/Json35r8.zip
Having manually downloaded Json35r8.zip
, you can unzip the file, navigate to Json35r8\Bin\Compact
, and manually add a reference to Newtonsoft.Json.Compact.dll
using the Add Reference dialog box.
Note that Json.NET 3.5.8 is old enough that some basic things are broken. See e.g. JSON.net CF 3.5, verify that JSON is complete for an example.