According to the log, it isn't installed. If it was in the folder it's supposed to be in, it would be in the list below of loaded modules.
If it was in that folder, but couldn't load for any reason, that error would also be logged, so I'm guessing it just isn't there.
18:35:45.290: ---------------------------------
18:35:45.290: Loaded Modules:
18:35:45.290: win-wasapi.dll
18:35:45.290: win-mf.dll
18:35:45.290: win-ivcam.dll
18:35:45.290: win-dshow.dll
18:35:45.290: win-decklink.dll
18:35:45.290: win-capture.dll
18:35:45.290: vlc-video.dll
18:35:45.290: text-freetype2.dll
18:35:45.290: rtmp-services.dll
18:35:45.290: obs-x264.dll
18:35:45.290: obs-vst.dll
18:35:45.290: obs-transitions.dll
18:35:45.290: obs-text.dll
18:35:45.290: obs-streamelements.dll
18:35:45.290: obs-qsv11.dll
18:35:45.290: obs-outputs.dll
18:35:45.290: obs-ndi.dll
18:35:45.290: obs-filters.dll
18:35:45.290: obs-ffmpeg.dll
18:35:45.291: obs-browser.dll
18:35:45.291: image-source.dll
18:35:45.291: frontend-tools.dll
18:35:45.291: enc-amf.dll
18:35:45.291: decklink-ouput-ui.dll
18:35:45.291: coreaudio-encoder.dll
18:35:45.291: ---------------------------------
18:35:45.428: ==== Startup complete ===============================================