Running Adobe Acrobat Pro on Mac OS Sierra Mac OS 10.12 Sierra is now a legacy operating system, which can make installing older software like Adobe Acrobat Pro a bit tricky. If you've come across terms like "xf-aaproxi" in your search for solutions, it typically refers to legacy activation methods or patches often found in community forums for older versions like Acrobat X or XI.
Turn off Wi-Fi/Internet completely before starting. Xf-aaproxi For Mac Os Sierra Adobe Acrobat Pro
Copy the resulting back into the Adobe window. Running Adobe Acrobat Pro on Mac OS Sierra Mac OS 10