The filters are registered during the installation process, but the VC++ libs must be installed first. In you case, there was probably incorrect detection of the required VC++ libs (libs were...
But at least it solved the problem with the dshowhelper.dll file.
Unpack the attached file into your MP x64 application folder and execute the 'install_filters.bat' as administrator.
Well, the only thing that comes to my mind is, the library has missing some dependecies.
Try to reinstall Microsoft Visual C++ packages:
Microsoft Visual C++ 2013 Redistributable (x64)
Microsoft...
You are wasting a time. To support AC-4, the TsWriter/TsReader filters must be updated first. And it's pointless to work on it if there is no support in LAV AudioDecoder.