>>708958
Because I'm such a nice faggot I made you a quick manual.
This is how you open an e621 downloader page and how you create a subscription for your query (which will cyclically check for new posts under those tags).
Think of the download page as a one-off (except if you save the session and reload it later) and of the subscription as a permanent content checker.
All files will be saved to the hydrus database directory on your hard drive and remain accessible offline.