Free Heroes2 (T-800 mod) is up to date moditication of open source engine fheroes2. The main thing in it is the Campaign support! Up to now it suports 3 Campaigns - 2 original campaigns and new one T-800.
Installing the game: As far as Free Heroes 2 (T-800 Mod) is an open source realization of the game Heroes of Might and Magic II, you need the data files from the original game which you can download with the DEMO Heroes2 version from the Start up menu.
If you have a FULL version of Heroes 2 game for PC (Dos or Windows version), simply copy the files from the original game to the SD card in the directory app-data/wiki.kvkozyrev.org.fheroes2t800/
How to install Russian, Spanish other languages take a look in the video https://www.youtube.com/watch?v=ezAWtfQ-8O4
If you have any questions regarding to installation or configuration of the game I will be happy to help any time.