Unzip the file to extract the 2 folders contained within, "saves" and "squaremap".
In the Modrinth Launcher, navigate to the modpack and click "Folder" next to the "Play" button.
Move the 2 extracted folders into the profile folder that has opened up. The "saves" folder within the profile should now contain the b8ches SMP world, and the "squaremap" should be below the "shaderpacks" folder.
Launch the modpack and play on the newly installed b8ches SMP world! IMPORTANT: DO NOT CHANGE THE WORLD NAME FROM "world"!
Navigate to localhost:8080 in your browser to view squaremap!