Guest downloads limited at the same time
The HTML /limit page tells guests they can only run a small number of downloads at once (default often 1), and to try again after a few seconds.
Why this happens
Anonymous viewers exceeded Simultaneous downloads for guests (ul2_sim_dl_anon). Enforced via app/nginx parallel caps — not upload File upload slots. Members see related but different “wait until current download finishes” / limit-page body copy.
Diagnose and fix
1. Visitor: wait for the active download to finish, then retry (~5 seconds as the copy suggests).
2. Users & limits → Simultaneous downloads — raise ul2_sim_dl_anon or set 0 for unlimited if the business allows.
3. See Parallel download limit page for the /limit UX.
4. Do not confuse with grant rate limits or bandwidth exceeded.