In a multi-part set, all parts (Part 1, Part 2, etc.) must be in the same folder before you can extract them. You generally only need to right-click Part 1 and select "Extract Here" to unpack the entire game.
Common objectives include the mission "Settling Down," which involves building the blacksmith and stable, and the first major raid to secure supplies.
Ensure you have enough room. The Steam Store and Ubisoft Store recommend at least 160 GB of available space, ideally on an SSD for better performance. Gameplay "Part 5" Context
If you are encountering this file while attempting to install or play, here are the most relevant details:
The "long piece" description accurately reflects the game's reputation for being one of the largest in the series: