In case the PDF signed and approved doesn’t generate the Download PDF.

Message: System unable to complete conversion to PDF. The file format you are using is not compatible or corrupted. Check our online help for possible resolution.

Resolution:

In such case, open the PDF (Better to open with Google Chrome) and click on Print option

The Print screen is opened with the Save as PDF option

Press Save button and save the same PDF file again

Add this Saved file as the Revision and Sign it.