Páginas como "docsitydescargargratis.com" , "linkgenerator ñim" o trucos con en la URL son fraudes. Normalmente:

Rellenar tus datos de estudiante te otorga puntos de bienvenida.

It sounds like you're referring to downloading documents from for free using a link, possibly with the word "ñoñim" (or a typo for "sin" – meaning "without" in Spanish). If that's the case: