Newest release of Psionic Yell. Press "more" for installation details.
For best results, run this mod with the provided exe client. Place the map folder "Psionic Yell" in the Maps directory in your StarCraft installation directory. Place SC1RS.exe in your StarCraft installation folder and run that to launch the game. Click single player and make sure to choose Brood War/expansion when prompted. Then choose Play Custom and make sure to choose "Use Map Settings" on the game setup page. The next map should load upon victory of the previous map.
Without SC1RS.exe, the mod is still playable, but heroes cannot be rebuilt and the AI is not enhanced. Unfortunately this means it is not compatible with Mac- I will endeavour to provide an alternative solution for Mac users.
NB: Some virus checkers will ping the mod because it injects data into the Starcraft client. There's not much I can do about that, I'm afraid.