As it turns out there were two versions of the DLL available and this one works with Marcus's help
Let>lib=c:\temp\Image2PDF StdCall.dll
LibLoad>lib,crepdf
LibFunc>crepdf,I2PDF_AddImage,result,c:\temp\test.tif
Let>errbuf=
Let>errbuf_SIZE=255
LibFunc>crepdf,I2PDF_MakePDF,result2,c:\temp\test.pdf,1,errbuf,255
LibFree>crepdf
MessageModal>%result%%CRLF%%result2%
Goto>EOF
Thanks Marcus, and if anyone else is looking for the DLL it is from Utility Warrior
