Original Info :
Sunflowers has released a free scenario for its real-time strategy/building game, Anno 1503 (aka 1503 A.D.). The 'Metropol' scenario "gives you the opportunity to prove yourself as a skilled master builder in a peaceful corner of the world, colonize large islands and benefit from the rich ore deposits and fertility offered in Metropol. And maybe you will receive a little surprise when your population exceeds 100.000 inhabitants".

Since the original installer will not work with the GOG version of the game, i just extracted the scenario files for manual installation. Extract the contents of the archive where "1503Startup.exe" is.

English Version :
https://www.dropbox.com/s/rotvv71ge1t9qru/Anno%201503%20Addon%20-%20Metropol%20Scenario_usa.zip?dl=0

German Version :
https://www.dropbox.com/s/4rlqlvdsh7xpv9n/Anno%201503%20Addon%20-%20Metropol%20Scenario_ger.zip?dl=0

IMPORTANT: Delete "Scenes.cach" from within Scenes folder otherwise it will not work. It will be re-created automatically, so no harm there.