Are you at the web site that I mentioned in your other thread which appears to relate to what you are asking now in this thread?
If you are...for Windows...File 1 is the .exe file which is need for extraction of files. File 2 is the .7z file which is the program itself.
Once you get them downloaded to your computer save location, you double click the exe to initiate the extraction, installation process. There are several scenario depending on the source of the download. Always assure that you are obtaining installation files corresponding to 32 or 64 bit whichever one applies to you.