You can download your current and past profile pictures using Google Takeout. The download will include the original image files.

Here are the steps:

1. Visit takeout.google.com
2. Click "Deselect all" then scroll down to the section titled "Profile" and check the box.
3. Click the Next Step button and then Create export.
4. Click the download link in the notification email you'll receive, or refresh the Takeout page until it appears ^* to download your small^† ZIP file named similarly to:

   takeout-20240803T174506Z-001.zip
   

5. The file will include:
   1. A thumbnail image of your current profile picture

      \Takeout\Profile\ProfilePhoto.jpg
      

   2. A subfolder containing the original images uploaded for your current and previous profile pictures. They retain their original names and much of the EXIF data:

      \Takeout\Profile\ProfilePhotos\*
      

^* Full account Takeout files can be extremely time-consuming to generate, but your file (only Profile selected) will be prepared very quickly, in as little as a minute or two.

^† The file will be very small, roughly the combined size of the profile pictures it contains.