Ranger – “Defense” [Campaign 5, Mission 3]

Wendy, the latest version of the patch: http://forums.ag.ru/?board=heroes5&action=display&s=0&num=1192719850&start=125 (post 134). If the purple unit doesn't find a path, after some time it will try again. Just make sure there is no hero at the castle gate. He should be in the garrison or wandering around somewhere, not blocking the path for the purple unit.

The h5m extension means it should be placed in the Maps folder. If there is no such folder, you need to create it manually.