I did try using Eltima RS232 Port Logger and was able to successfully capture, and save to a TXT file, all 81 frames of data (66 items per frame) sent by the Print function of MD802 (to the COM port).
It is perhaps to be noted that the size of the TXT file, produced by copy/paste from the Autel Printer software, was 256 KB (262,565 bytes), and of a size on disk of 260 KB (266,240 bytes), for the 54 of 81 frames received. The 256 KB number will probably flag, for someone more technically knowledgeable than I, a possible cause for the printing failure when being received by the Autel Printer software.
The size of the resultant TXT file, for all 81 frames, successfully saved by the Eltima RS232 Port Logger was 376 KB.
Conclusion: Use the RS232 Port Logger (freeware) instead of the Autel Printer software (as released in Autel PC Suit ver 6.31) ... at least until Autel ever gets around to fixing this problem. This problem/fix happened using Win7.
Thank you to Unrealfighter for originally posting this problem, and for identifying RS232 Port Logger as the solution.