The "portable" version is essentially the standard Windows build, which comes as a ZIP file that doesn't require a traditional installation. This allows you to run the game directly from a folder or a USB drive.
You will often see the term attached to the download file. Here is what that means for you as a player: summertime saga 02017 download for pc upd portable
: If you specifically need version 0.20.17 for compatibility or modding, Uptodown's Version History The "portable" version is essentially the standard Windows