Please followed the instructions how to install it?
Step 1: Launch Steam App (Not thus the web) and sign in using your steam account
Step 2: Make sure you purchase Cities XXL and Cities XXL Map Editor
Step 3: if you haven’t install Cities XXL please make sure you install Cities XXL Base Game before installing Cities XXL Map Editor
Step 2: Click Library
Step 3: You will needed to click ‘all menu‘ and check tools it’s under home tab
Step 4: found and search Cities XXL Map Editor
Step 5: Once you have found Cities XXL - Map Editor right click and click Install Button
Step 6: Once you have completed the downloading and installing the map editor please launch it
Step 7: Once you have created a map for cities xxl you are more welcome to submit your maps in our resource page so other’s members can download the map and enjoy you have created!
Notes 1: Once you have completed the map please install the map in cities XXL under paks folder and test it to confirm its fully working on your side
Note 2: Make sure Cities XXL is installed properly before installing the map editor sometimes map editor may fail launch if cities xxl is not installed correctly