NSIS 2.28 and System/SysFunc
I thought I'd give some feedback.

I installed 2.28 and when I tried to include System, I got a compile error.
As it turns out, the includes: "SysFunc.nsh" and "System.nsh", the plugin "System.dll" (I think there was another dll, I forgot already), they were all in the same .\Examples\System folder. Once they were moved to their proper locations, it was fine.