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I checked it at work to see if the link downloads properly. I chose the English version 1.1, and it seemed to download fine. But the disk image is awful; I didn't even try to do anything with it. And of course, the size. My first Heroes game was around 24 MB. It had everything you needed – 18 single-player scenarios, plus about 4 scenarios for multiple players, and of course, campaigns. As far as I understand, there were 9 such maps. Maybe it was a demo version, but you could play it for months, which is what actually happened.
Added 4 hours 21 minutes later
I should have left Book of Heroes alone; it's not a popular title. The translations are terribly bad, and I was often very confused. I didn't understand the difficulty percentage in Jolly Roger at all; it's lower than in any scenario. I changed the difficulty percentages to 10% for Crossroads, Two if by Sea, Knight's Quest, basically everything that was a hard difficulty level. I really don't understand why it weighs almost 100 MB.
I completed the first mission as a Knight, but no matter how hard I tried, the neutrals turned out to be a pain. I didn't have enough 500 gold for another hero. During the battle with the blue bird, morale wasn't showing. There were 8 ogres in the village; I've never seen anything like it. In general, I tried for 3 days, but I couldn't complete it in 2.
I replayed it in 2 days and even managed to complete the second mission, but it took 11 days.
In general, I'm very excited, just like I was back in '96, especially when I built the Red Knights.