Mount Nexus2.iso and open the cd.
Run the Nexus2 setup
Put Nexus 2 content folder in C:\Program Files\VstPlugins
open FL studio and go to Channels->Add one-> More..->Refresh->Fast Scan.
Scroll down and ull see Nexus in red marked.. Double click it
Now it will load the Nexus Content folder..
when that is finished go to 'sys' in nexus and then click Import Data.
Select all the expansions located in the 'Expansions' folder, by holding CTRL and moving the mouse. press Open.

thats it