BitDay-changer is an automated wallpaper changer for the BitDay package by /u/BloodyMarvellous
Make a new directory where you want the wallpapers to be placed and run the following command:
wget https://github.com/hashhar/BitDay-changer/raw/master/install.sh
Then just make sure you have execute permissions on the install.sh file:
chmod +x install.sh
And run it:
./install.sh