Hi
First step is, of course, making sure you already have the Populous the Beginning complete game installed on your pc.
then download this campaign (age of chaos)
run the "setup"
if still problem, just download from another place:
Onedrive.live.com
campaigns -> age of chaos`
extract the files and replace from the ones in ur pop directory
pedro-poupado
Pedro joined
Pedro - Portugal Games: Populous: The Beginning League of Legends Warlords Battlecry (2 and 3) some others