You can download up to 500 items at a time from your Camera Roll or an entire album by clicking the Download icon on the album thumbnail. Flickr will then email you a link to a .zip file once it is ready.
Several specialized tools can simplify large-scale downloads or help you preserve metadata that might otherwise be lost. Downloading content from Flickr - Flickr Help how to download photo from flickr
Select your preferred image size from the pop-up menu (e.g., Original, Large, Medium). You can download up to 500 items at
For individual images, the Flickr Help Center notes that the process is designed to be straightforward if the owner has enabled permissions. Open the photo you wish to download. Downloading content from Flickr - Flickr Help Select
If you need to download multiple photos or your entire history, provides built-in tools to package your content into .zip files.