Daggerfall Unity is an Elder Scrolls 2 Daggerfall re-implementation in the Unity Engine, and Bossfall is a fork of that game, changing things that a normal mod can't. Aside from some changes, it is at it's core still Daggerfall unity and has mostly the same mod support. You do NOT need to own a copy of Elder Scrolls 2 Daggerfall to play this.
Daggerfall Data Files - https://drive.google.com/uc?export=download&id=0B0i8ZocaUWLGWHc1WlF3dHNUNTQ
Install Bossfall into it's own folder anywhere, then install the Daggerfall Data files into the same Folder. These files are a stripped down version of the ones Bethesda has given away for free for years. From there Bossfall will run.
Mods for Bossfall need to be installed inside sub-folders within Streaming Assets. Most .dfmod files go in Mods, but some also go in Textures and Questpacks, pay attention to any mod pages for installation instructions.
Recommended for Everyone:
Daggerfall Quest Pack 2 - https://www.nexusmods.com/daggerfallunity/mods/243
The Forgotten Quest Pack - https://forums.dfworkshop.net/viewtopic.php?t=3643
Better Ambiance - https://www.nexusmods.com/daggerfallunity/mods/139
Roleplay and Realism Items Addon - https://www.nexusmods.com/daggerfallunity/mods/61