SAPPDFPrint is used for printing PDF spool requests using front-end printing (access method G) or SAPSprint (access method S). PDFPrint is therefore installed on your local PC with method G, or is installed on your Windows SAPSprint print server when printing with method S.
The patch level of SAPPDFPrint you use is dependent on the SAPGUI patch level or the SAPSprint patch level. So when you print with method G, SAPPDFPrint needs to use the same bit version as your SAPGUI (32-bit) and also use a compatible patch level. In general it is recommended to use the latest patch version available of both SAPGUI and PDFPrint together.
Similarly, when printing through SAPSprint, SAPPDFPrint needs to use the same bit version as your SAPSprint (32 or 64-bit) and also use a compatible patch level. In general it is recommended to use the latest patch version available of both SAPSprint and PDFPrint together.
Related SAP Notes:
1444342 - Device type-independent printing of ADS forms
1490835 - Patches for PDFPRINT
1783811 - Improved version check of PDFPRINT
1822381 - Assignment version info patch level SAPSprint/SAPFprint 730
1909193 - 64-bit versions for SAPSprint and SAPPDFPRINT
