DinkToPdf dll not found libwkhtmltox

I am developing a .net5.0 web api and i am getting the following error while using DinkToPdf:

DllNotFoundException: Unable to load DLL 'libwkhtmltox' or one of its dependencies: The specified module could not be found. (0x8007007E)

I have followed this tutorial, with a few exceptions:

• added the service added the service, which was not done in the tutorial

  services.AddSingleton(typeof(IConverter),
           new SynchronizedConverter(new PdfTools()));
  ...
  services.AddScoped<IPdfService, PdfService>();
  

• named the services differently, but that shouldn't matter

• installed it via NuGet instead of Install-Package DinkToPdf

• my project is just an API, frontend is not in C#, shouln't matter sincer the error is here:

  return this._converter.Convert(htmlToPdfDocument);
  

Did everything else like in the tutorial.