I would love to but my homm crash when I click on the button to play online =( any idea to fix that ?
In Windows 10 you need to install the DirectPlay addon which is by nature removed from Windows 10. DirectPlay can be installed under Control panel (Old style one) and "programs and functions". On the left hand side you have something called "Turn Windows functions on or off". Press that, identify the tab that has "DirectPlay" under it and install it.