There's something you missed ... the "new PDF Reader" that you are talking about is EXACTLY THE SAME as what I call the "NEW / BETA" PDF Reader
You do need both updates (applied in the specific order -> the first update "UPD. 12.12.12
" contains 3 files, the second update "UPD 2013.01.02
" contains 2 files).
For each of these updates, make sure that the unpacked files are present in the MAIN directory of the "Internal Storage" (you MUST NOT unpack these files into any "sub-directory" there).
Then disconnect your M92 from USB, open the "Internal Storage" and click the "update.oar" icon (the device should reboot automatically when applying the first update but not for the second one).
Afterwards, you can delete all these update files.
Note: you are NOT allowed to put them on your SD card -> use "Internal Storage".
Note also: you need to turn it on using "Settings" -> "Preferred Applications" -> "try new Pdf Reader (beta)".