Converting .PDF files for Acrobat 5.X compatibility
Acrobat 5 only supports PDF revision 1.4 because of its age. Fortunately, many tools exist to facilitate the conversion of modern documents to a compatible format.
One open source utility that can perform the conversion is GhostScript, which is available on macOS (Homebrew) and Linux.
The following command can be used to convert files into PDF 1.4 format:
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