100 Days In Minecraft Horse Edition 

Step 1: Download Curseforge app

Step 2: Click on the 'Modpack' Button linked above

Step 3: Click the three dots on the right and select 'Install with Curseforge app'

Step 4: Wait for it to install

Step 5: Go to 'My Modpacks'

Step 6: Select the newly downloaded 100 Days Modpack

Step 7: Click the three dots on the right hand side next to 'Play'

Step 8: Click 'Open Folder'

Step 9: Double click on 'Saves'

Step 10: Download the World from Google Drive via the 'World' button above

Step 11: Drop the zip file into the 'Saves' folder

Step 12: Unzip the file

Step 13: Go back to the Curseforge Launcher and click play. The world should appear in Singleplayer