The warning on the site was clear: "Install at your own risk. The engine is fragile."
You must install patches FIRST, then gameplay mods (XLR4), then asset packs (CAM), then aesthetic mods last. Never install two mods that edit the same Gameplay.patch file – they will conflict. cities xl platinum mods free
Most free mods for the Cities XL series are hosted on dedicated community sites. You typically need to create a free account to download files. The warning on the site was clear: "Install at your own risk