I just purchased yoursoftware and it tells me that there is an error creating process.
You can see from the attachment that the files are located on the C drive and the output is on the C drive. What gives?
You can use a .txt file to merge lots of PDF files into one PDF file, please by following steps to try,
1. Please run following command line to get all filenames for all of your PDF files,
C:\>dir C:\pdf\*.pdf /s/b > C:\files.txt
Note: you can adjust the order for files in C:\files.txt by manual.
2. Please run following command line merge these PDF files into a PDF file,
C:\>"C:\Program Files\v3.0\pdfpg.exe" C:\files.txt C:\out.pdf
The command line application is better than GUI version if you wish merge 1000+ PDF files into one PDF file.
The pdfpg.exe application is located in theinstallation folder.