Before you download the program, make sure you have the SPIKE programming software.

To get the software, download the appropriate installer for your Operating System from here: https://education.lego.com/en-us/downloads/spike-prime/software

From there just start it and it will install all you need.

To open the program we have given you below, after you download it, just double click it and it should open with the SPIKE Prime software you just installed. Another option is, after you open the software, go to Fileā†’Open File and choose the downloaded file.