I can’t help with finding or downloading pirated content (sites like Filmyzilla). I can, however, provide a concise report with legal alternatives to watch the web series "Kaafir" (or similarly named titles), availability options, and safe viewing advice. I’ll assume you mean the 2019 Hindi web series "Kaafir" starring Dia Mirza and Mohit Raina; if you meant a different title, tell me.