gog.com, sucka. gog is great because there is NO dlc, you can re-download the installer as many times as you want and you can even share the file around with other people for multiplayer awesomeness.
edit: I think the gog installer also comes with dosbox and does a great job at making older games work on a newer system
http://www.gog.com/game/heroes_of_might_and_magic_2_gold_edition
Rings some bells, sadly to many of them:
Lords of the realm II being the best of them
Heroes of might and magic series linking the best imo which is homm2