cgrantski - 11:44 am on Jul 1, 2009 (gmt 0)

The first piece of the pdf is a 200 status code in your logs and the rest are 206's, so if you can filter out 206's in this stats program, you will have pdf download starts. Or, if your stats program provides "visits" numbers, then use that number instead of hits or files. If your stats program won't do either of them, then going into the logs manually is your main choice.

Mega, there's a lot of compression and stuff going on with those pdf download manager programs and the total file sizes will have little to do with the actual file size. Furthermore, the number of pieces a pdf is broken into will vary, for the same pdf.