Use the Vinted Photo and Data Downloader add-on to download from Vinted: on product pages:

complete product data (in JSON format), including id, title, description, price, seller information, dates, photos urls, etc.
summary (in text format), including url, title, description, seller username and id,
photos in full resolution;

on conversation pages:

complete conversation (in JSON format),
complete shipping and tracking data (in JSON format),
images in full resolution.

NOTE: Vinted added a challenge to download conversation data. In order to bypass this challenge, the extension now requires more permissions. If this is an issue for you, you can contact me and I will separate downloading products vs conversations in 2 different apps (one requiring almost no permission, and one needing more permissions). This is useful to archive information about your transactions on Vinted, since sold items may be deleted by the seller and conversations are deleted automatically by Vinted after a few months, and there is no easy way to download this information directly from the site. Once installed, navigate to a Vinted product or conversation. The Vinted Photo and Data Downloader icon appear in the address bar: click on it to reveal the download buttons. The code source is available on Github. Vinted is an European online marketplace for buying and selling second hand items. You can access it at vinted.fr, vinted.it, vinted.be, etc. I am not affiliated with Vinted in any way.