PDFCreator version 1.7.3 was a major maintenance release in the "old branch" of the software, officially launched on April 25, 2014

If you meant something else (like you’re looking for the actual installer for “pdf creator old version download 17.3 upd”), just let me know and I can guide you to safe sources.

COM Interface Stability: Version 1.7.3 is the last version to support the original COM interface API. Applications built to automate PDF creation using this older API will break if updated to 2.x or higher without a complete code rewrite.

Key Characteristics of the 17.3 Update (Upd):