Put flickr download file to your localhost.
Get KEY and SECRECT at https://www.flickr.com/services/apps/create/.
Open index.php and change $callbackURL = "http://localhost/flickr_download/index.php"; and update key,secrect.
If your folder name is flickr , it will be like $callbackURL = "http://localhost/flickr/index.php";.
Open in browser http://localhost/flickr_download/index.php.
It will authorize oauth and after finish you will receive token and secrect.
Example:
O_TOKEN: 86157674079732196-70bdda496a9f908f
O_SECRECT: b2a74ac72785db78
Update O_TOKEN and O_SECRECT in download.php.
Afer that , run
php download.php
It will create download folder and download all photo in there.