It was difficult to get the multiplayer working, but finally we discovered that everyone had to turn off their firewalls and install a program called Hamachi. Then it worked fine.
Saw on Steam that Heroes III HD is available, but reviews there recommended rather to get HD and HOTA modes through GOG. Looked it up here, did not find, but found elsewhere, so I post the link in hopes it could help someone else also: https://www.reddit.com/r/heroes3/comments/cdg86x/adding_hota_and_hd_mod_to_gogs_complete_edition/?xpromo_edp=enabled As a child I learned English from this game and now use it to help learning Polish.
Got this game in order to practice Polish and German. It has many other languages as well so for practicing languages it is a good tool. Very beautiful game, wonderful graphics and the storyline was also beautiful, except the ending did not make much sense. One would have expected a fairytale to have a happy ending, but the ending was unresolved and abrupt. Also the good characters almost turning on each other in their quest to defeat the evil queen was somewhat illogical, and in the end it is confusing whether the evil queen actually was evil or was she good, and if she was good, how could she send out monsters to achieve her good ends...? Or if she was evil then why choosing to smash the mirror has an unhappy ending? It would be good if they would make a sequel and tie the loose ends of the storyline to make a happy ending.
