THE POPULOUS BIBLE
B.8 Populous Load game
Once you press load game, you will see a tab with saved files. If you have no saved files, there will be none, meaning you will have no saved file to continue from. If you are playing the single player, make sure to save from time to time, it can get boring to play the same level again because you forgot to save it after it was completed.
How to have a saved file? You can do this both in the solar system, or inside a level itself, by pressing "esc" and going to "save game". Don't forget to save in a new file, unless you want to overwrite an old saved file. Make sure to name it, or it will get confusing if you have many saved files.
To finish, you can also download an ALL LEVELS SAVE file. Aim to the K. Section and look for it. All the instructions are there you to follow.