Here is a better tutorial:
Step 1: Download WinRar if you have not already.
https://www.win-rar.com/download.html?&L=0
It is free, if it asks you to pay just ignore it
Step 2: download the file
Step 3: right click the file, it should look like a pile of books
Step 4: click "extract files"
Step 5: Open the folder that has appeared, it should have an EXE file, double click that, and enjoy your NEW BitBuddy™!