I have seen a couple of people on the forums asking about this error, and
since I found a fix, I wanted to share it with everyone. I was having an
issue with an hp 5100n. It was giving me the iprint zlib - 536870654
error, and the fix I found was to go into the printer's inf file, and
remove AUTOCFG_FILES from the CopyFiles line of the [HPBF252I.PMD] section.

The original section looked like -

; Installer Sections
[HPBF252I.PMD]
; To Disable Add Printer Auto Configuration: Remove "AUTOCFG_FILES" from
the CopyFiles line below
DataSection=HPBF252E_DATA
CopyFiles=AUTOCFG_FILES,HPBF252E_FILES,LANGMON_FIL ES,LANGMON_DRVCOPY
DataFile=HPBF252I.PMD

The new section looks like -

; Installer Sections
[HPBF252I.PMD]
; To Disable Add Printer Auto Configuration: Remove "AUTOCFG_FILES" from
the CopyFiles line below
DataSection=HPBF252E_DATA
CopyFiles=HPBF252E_FILES,LANGMON_FILES,LANGMON_DRV COPY
DataFile=HPBF252I.PMD

Happy iPrinting.