So, which Visual C++ did you install?
Granted its long, but the Adv Scene Switcher thread mentions a few months ago a DLL re-compile that now needs the 2019 (or otherwise very recent) version of Visual C++
Then make sure which version of OBS you are using, and its install path (you can install x64 OBS version into 32-bit path.. you shouldn't, but you can ... Plug-in instructions assume you installed into normal/default but notes your path may very..)
So which DLL did you put where, exactly?