I can download the transcripts as pdf and can save them under a different file name, just can't combine with another pdf file.  Using Adobe Acrobat XI Standard.

I just get this message as an additional log file when saving and printing:

%%[ ProductName: Distiller ]%%
This PostScript file was created from an encrypted PDF file.
Redistilling encrypted PDF is not permitted.
%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%
%%[ Warning: PostScript error. No PDF file produced. ] %%