To: Bill M
Yep, PDF image format is not supported by AVS Image Converter.
"AVS Image Converter.dll not found" maybe suggest that your .dll is not installed correctly, I think.
I'm a green hand, I'm testing an image converter recommended by my friend recently, and I have not met such kind of probelm.
Or you can choose another one to have a try.
Best regards,
Arron