I often share photos with others using a link to a google album. To download the photos from Google Albums is easy. At the top right find the more options menu (three dots icon)
Click on the 3-dots to open the menu, and select download all
A file download dialog will open asking where to put the ZIP file containing the photos from the gallery. Download this file and you can extract all the images from the gallery in one go.
If you only want one or two from a large gallery, click on the gallery thumbnail to open the specific image. There is a 3-dot menu under which is the option to download that image (this downloads an image file so you don’t need to bother with extracting the image from a zip file).