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Hello.
I am sorry for my English.
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PDF Printer, Bullzip, Version 10.23.2529 - free
Windows 10, 64 bit
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I tried merge 30 PDF files.
In the resulting PDF file does not merge all files.
Still omits approximately 5 files.
Can someone help me?

I recommend that you try version 10.24 or later. This version will disable the parallel printing by default. When merging files, it is important to wait for the previous job to finish.

Regards,
Jacob

There are many tools available online who can convert multiple PDF files into single one. Search them by typing "Merge PDF files".