"Przekroczony dzienny limit wywolan" - means you have exceeded daily limit of downloads.
Please keep in mind that the service will limit or shut down if everybody starts to overload it. If you are downloading massive amounts of data, please use paid data service like Premium Data.
Stooq site does not have control over download range (always all quotes are returned). Correction: control over download range will be included in 3.21
And it has limits so please do not use it for everyday quote updates. Stooq should be used just once for initial history download. For current updates of US stocks use Yahoo current (Current does not suffer from dividend adjustment problem).