Ir order to open the rar archives, first you must have the program installed on you pc.
Access this link:
https://www.win-rar.com/fileadmin/wi...ar-x64-570.exe
After the download is finished, just open it to install the Winrar on your computer. Done, now you will able to open the rar an zip archives.
This link is for windows only. If you are on Mac or any other Apple platform, this link will not work.