Follow the link : https://imagej.net/Fiji/Downloads

Select the correct system you will be running FIJI on

Follow the link for user guides for FIJI: https://imagej.net/Using_Fiji

FIJI=FIJI is Just Image J

Image J is the basic version of the application, FIJI comes with pre-installed applications

The specific plugins can be found at this link: https://imagej.net/Category:Plugins

*Cell counter is an included plugin with FIJI