If you're on Android, then you need to unzip the file and install the apk ( https://www.androidauthority.com/how-to-install-apks-31494/ )
If you're on PC, Mac or Linux then you simply download the relevant file above, unzip it ( https://support.microsoft.com/en-us/windows/zip-and-unzip-files-f6dde0a7-0fec-82... ) and then click on the .exe file inside :)