Hello Max,
You install all new, run Espionage so that it goes through the setup process and then drag the protected folder, one by one, over Espionage window. Espionage should realize that these were protected by Espionage and ask you for the folder password. Once entered, it should add the folder to the list of protected folders.
Make sure you lock the folders before you shut down the first mac.
Let me know if you get stuck.
Rgds
Zsolt