The nuget cache for a user account is normally located under
C:\Users\<user>\AppData\Local\NuGet\Cache
.
But where is it to be found for the LOCAL SYSTEM account? This special user has no ordinary profile.
This combination is a quite common scenario for a build server, e.g. TeamCity.
On a 32-bit machine it's located under
%windir%\System32\config\systemprofile\AppData\Local\NuGet\Cache
.
On a 64-bit machine it's located under
%windir%\SysWOW64\config\systemprofile\AppData\Local\NuGet\Cache
.