"Stalker Portal Player for PC v71 by Sahbaz" appears to be a modified iteration of the open-source Stalker Middleware client (originally developed by Infomir) or a derivative of the popular "Stalker Player" for Windows. The version number (v71) suggests significant deviation from the official versions, which typically use different versioning schemes.
Stalker Portal is a specialized middleware used by many IPTV providers to deliver live TV, movies, and series via a MAC address-based system. While many users have traditionally relied on apps like StbEmu, the v71 version by Sahbaz stalker portal player for pc v71 by sahbaz better
Yes, the software is free. Some developers accept donations. Be wary of anyone selling it. "Stalker Portal Player for PC v71 by Sahbaz"