I assume Google Photos given the community, all things Google should be downloadable through Google Takeout ( takeout.google.com )

Google takeout for Google Photos. If you have the space, add it to drive for downloading as the links expire if you request it for download instead. Choose the largest file size as otherwise it’s a pain to download. Be aware the meta data is not useful. If you are going to use Immich, Immich-go can help import direct from the zip files you creat.