To use At Ease addons, you need Operation Flashpoint GOTY/Resistance version 1.90 and higher and Windows installer support present in your OS (it's usually already part of Windows, if you have and older version you may download it from Microsoft).


Installation
The Addon At Ease will install automatically. It will also install a readme file within your Operation Flashpoint directory to AddonsAtEase folder.

You can uninstall or repair the addon if you click on the Addon At Ease msi file again or using the Add/Remove Programs control panel (look for OFP Addon entries in the list of programs).

Have fun
See readme of the addon for more information and look to SINGLE MISSIONS folder for a directory "Addons At Ease..." where you can find mission for all the addons at ease you have so far.