Unzip the EZ1 file to any folder.
In your addon scenery folder create a folder called EZ (this is not critical, you can name it hamster if you like)
Take the two folders Scenery and Texture from the uzipped EZ1 folder and copy/move them to the new EZ/Hamster folder in the addon scenery folder you just made.
Start FSX
Go to the settings tab and open the scenery library
Select Add
Browse to the folde you made and click it, do not click past it.
OK that, you should now see EZ/hamster at the top of the list which is OK,
OK out of the library which will now update the database.
Check out the scenery and see if it works.