How to reference 1.9.4 version libraries in Excel-VBA?

Hi,

I have been using version 1.7.3 and referenced it in
Excel-VBA where I have a function to merge 2 pdfs. I used "MergePDFFiles_2" method of the "pdfforge.pdf.pdf" object. But now I
have upgraded to version 1.9.4 and cannot reference to the "PDFCreator".
Can anyone please help how can I reference libraries of PDFCreator in
Excel-VBA?

Thanks in advance