The long-in-development fan-made mode has finally released after years of development and some unfortunate recent delays.

We’ve been hearing about Fallout London for years now, but the long overdue fan-made expansion-sized mod has finally released. Check out its launch trailer below, which offers a glimpse at its story set in a post-apocalyptic London.

Being fan-made, Fallout London is obviously not an official part of the larger Fallout canon, but it does bring new quests, a new location, an extended dialogue system, new companions to meet and recruit, and plenty else for players to dive into.

Fallout London was originally due out this April, but it got delayed at the eleventh hour when Bethesda announced that it was released the long-awaited Next-Gen Update for Fallout 4, which would break compatibility with mods. Following that, GOG has also been aiding in Fallout London’s testing.

To install and play Fallout London, you will need to own the Fallout 4 GotY edition. If you’re playing on Steam, you’ll also need to ensure that the game’s version number is set to before the aforementioned Next-Gen Update was released.