Hi there. I have the same issue.
I do not have these files in my directory
The component can be in one of these file path:
C:\Users\[User Name]\AppData\Roaming\NCH Software\Components\aacenc3\aacenc3.exe
C:\Program Files (x86)\NCH Software\Components\aacenc3\aacenc3.exe
These are the files that I have
avcodec-55.nch.dll
avformat-55.nch.dll
avutil-52.nch.dll
swresample-0.nch.dll
swscale-2.nch.dll
Please help me.