Hi Evening Star!
Alexandria places the new scenarios always in
my documents\Tilted Mill\Children of the Nile\scenarios
Your old savegames and scenarios may be in the same location as you originally installed the game. You can copy them into the my documents folder to see them again, too.
When you download an user created scenario, you are asked where you want to save them. If you don´t remember where you saved it, do a search for the file via explorer and drag it into the my documents\etc. folder, then it should show up in the list. Or you simply download the scenario again.
Hope this helps! Otherwise, maybe the guys and girls in the tech support forum can help you.
