I'm running Windows 8.1 Visual Studio 2017 Monogme 3.6. I've got FreeImage.dll on my system. Here's the error message:
location of file
Importer 'TextureImporter' had unexpeted faliure!
Sytem.DllNotFoundExpecion: Unable to load DLL 'FreeImage': The specified module could not be found. (Expectation from HRESULT: 0x8007007E)
And so on.