Simply download your pictures from Google Photos directly to your computer. It's so easy. Here's how:
In Google Photos, rest your mouse pointer on any photo. You'll see a small, empty white circle appear in the upper left corner of the photo. Click once inside the circle, and the circle will turn blue and there will be a white check mark inside. The photo is now 'selected.' Do this over and over until you've selected every photo that you wish to select.
Now click once on the three-dot menu in the upper right corner of the Google Photos web page. The menu opens and choice #1 is 'Download.' It's that simple.
Since you use Google Photos, that means you have a Google account (because you can't use Google Photos without one.) And since you have a Google account you also have Google Drive, GMail, and all the other features that come with a Google account. You don't have to use any of them, of course.