Move all downloaded parts into the exact same folder on your computer.
Install the official RAR app by RARLAB from the Google Play Store.
Download the official WinRAR or the free, open-source 7-Zip . Mac: Use the free app The Unarchiver or Keka .
You need to download every single segment belonging to the set (Part 1, Part 2, etc.).
To successfully open and merge these files, follow these steps: