The latest version of this plugin is "0.6.0.1" for "OBS v31" version For the plugin to work you need to have "OBS v31". Do not update the program.
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Releases · sorayuki/obs-multi-rtmp
OBS複数サイト同時配信プラグイン. Contribute to sorayuki/obs-multi-rtmp development by creating an account on GitHub.