Similar to the problem below, OBS Studio won't load the plugin and seems to produce the same error (with slightly different formatting). I have tried installing the suggested VC++ runtimes (which apparently fixed it for the previous issue) but it did not work for me. Please see below the log file generated after installing the VC++ runtimes, which looks the same as it did before.
Also, please feel free to giggle at the age of my system. Still going strong 10+ years later.
01:44:05.082: CPU Name: Intel(R) Core(TM)2 Quad CPU Q9450 @ 2.66GHz
01:44:05.082: CPU Speed: 3600MHz
01:44:05.082: Physical Cores: 4, Logical Cores: 4
01:44:05.082: Physical Memory: 8190MB Total, 5554MB Free
01:44:05.082: Windows Version: 6.1 Build 7601 (revision: 24024; 64-bit)
01:44:05.082: Running as administrator: false
01:44:05.082: Aero is Disabled
01:44:05.083: Portable mode: false
01:44:05.101: OBS 21.0.1 (64bit, windows)
01:44:05.101: ---------------------------------
01:44:05.102: ---------------------------------
01:44:05.102: audio settings reset:
01:44:05.102: samples per sec: 44100
01:44:05.102: speakers: 2
01:44:05.104: ---------------------------------
01:44:05.104: Initializing D3D11...
01:44:05.104: Available Video Adapters:
01:44:05.106: Adapter 1: NVIDIA GeForce GTX 1050 Ti
01:44:05.106: Dedicated VRAM: 4192665600
01:44:05.106: Shared VRAM: 4025626624
01:44:05.106: output 1: pos={0, 0}, size={1920, 1080}, attached=true
01:44:05.110: Loading up D3D11 on adapter NVIDIA GeForce GTX 1050 Ti (0)
01:44:05.142: D3D11 loaded successfully, feature level used: 45056
01:44:05.936: ---------------------------------
01:44:05.936: video settings reset:
01:44:05.936: base resolution: 1920x1080
01:44:05.936: output resolution: 1280x720
01:44:05.936: downscale filter: Bicubic
01:44:05.936: fps: 30/1
01:44:05.936: format: NV12
01:44:05.939: Audio monitoring device:
01:44:05.939: name: Default
01:44:05.939: id: default
01:44:05.939: ---------------------------------
01:44:05.941: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/chrome_elf.dll' not found, loading of module failed
01:44:05.942: [CoreAudio encoder]: CoreAudio AAC encoder not installed on the system or couldn't be loaded
01:44:05.965: [AMF] <obs_module_load> AMF not supported (no AMD graphics)
01:44:05.965: Failed to initialize module 'enc-amf.dll'
01:44:05.972: LoadLibrary failed for '../../obs-plugins/64bit/input-overlay.dll': The specified module could not be found.
01:44:05.972: (126)
01:44:05.972: Module '../../obs-plugins/64bit/input-overlay.dll' not loaded
01:44:05.986: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/libcef.dll' not found, loading of module failed
01:44:05.987: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/libEGL.dll' not found, loading of module failed
01:44:05.987: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/libGLESv2.dll' not found, loading of module failed
01:44:05.988: Failed to load 'en-US' text for module: 'obs-browser.dll'
01:44:05.988: [browser_source: 'Version: 1.29.0']
01:44:05.990: NVENC supported
01:44:06.070: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/uiohook.dll' not found, loading of module failed
01:44:06.070: Couldn't find VLC installation, VLC video source disabled
01:44:06.077: No blackmagic support
01:44:06.082: [Media Foundation encoder]: plugin is disabled for performance reasons on Windows versions prior to 8
01:44:06.084: ---------------------------------
01:44:06.084: Loaded Modules:
01:44:06.084: win-wasapi.dll
01:44:06.084: win-mf.dll
01:44:06.084: win-dshow.dll
01:44:06.084: win-decklink.dll
01:44:06.084: win-capture.dll
01:44:06.084: vlc-video.dll
01:44:06.084: text-freetype2.dll
01:44:06.084: rtmp-services.dll
01:44:06.084: obs-x264.dll
01:44:06.084: obs-vst.dll
01:44:06.084: obs-transitions.dll
01:44:06.084: obs-text.dll
01:44:06.084: obs-qsv11.dll
01:44:06.084: obs-outputs.dll
01:44:06.084: obs-filters.dll
01:44:06.084: obs-ffmpeg.dll
01:44:06.084: obs-browser.dll
01:44:06.084: image-source.dll
01:44:06.084: frontend-tools.dll
01:44:06.084: enc-amf.dll
01:44:06.084: coreaudio-encoder.dll
01:44:06.084: ---------------------------------
01:44:06.084: ==== Startup complete ===============================================
01:44:06.087: All scene data cleared
01:44:06.088: ------------------------------------------------
01:44:06.126: WASAPI: Device 'Speakers (Realtek High Definition Audio)' initialized
01:44:06.159: adding 23 milliseconds of audio buffering, total audio buffering is now 23 milliseconds
01:44:06.512: Switched to scene 'Scene'
01:44:06.512: [game-capture: 'Game Capture'] attempting to hook fullscreen process: explorer.exe
01:44:06.512: [game-capture: 'Game Capture'] cannot capture explorer.exe due to being blacklisted
01:44:06.513: ------------------------------------------------
01:44:06.513: Loaded scenes:
01:44:06.513: - scene 'Scene':
01:44:06.513: - source: 'Game Capture' (game_capture)
01:44:06.513: ------------------------------------------------