Be advised however, that classic OBS is not being developed anymore and thus will not receive any updates or new features anymore.

If you are using Windows, you can use both the classic version of OBS and OBS Studio. OBS Studio is a complete rewrite of the popular OBS Software with greater development possibilities for plugin developers while being available on Windows, Linux and Mac OSX.

DirectShow capture device support (webcams, capture cards, etc) The installer includes both 32bit and 64bit versions. Intel Quick Sync Video (QSV) and NVIDIA NVENC. x264, H.264 and AAC for your live streams and video recordings. OBS features: Live streaming to Twitch, YouTube, Periscope, GoodGame, DailyMotion, Hitbox, VK and any other RTMP server. OBS Studio supports multiple sources, including media files, games, web pages, application windows, webcams, your desktop, microphone and more. It is the re-write of the widely used Open Broadcaster Software, to allow even more features and multi-platform support. Open Broadcaster Software (also known as OBS) is a free software for video recording and live streaming designed for capturing, compositing, encoding, recording, and streaming video content, efficiently.

For mac instal OBS Studio 29.1.3