Hi, Rather coincidentally, I have pretty much the same question but Paul's answer doesn't seem to help. I'm in the process of recovering from a hard disk crash and I get very different results from the DVD and downloadable SE Vol. 1 libraries.
To make a long story short, I've reinstalled my original Special Edition Vol. 1, four DVD set, and the resulting "100 Special Edition" folder contains 113 files (named Special Edition001.DAT through to SpecialEdition113.DAT) and 53.5 GB of data. Note that the file names don't indicate what instrument(s) might be inside.
The four downloadable files for the same special edition produces four folder (as compared to one from the DVDs), and they're named SE_Volume-1_Brass, ~_Percussion, ~_Strings, and ~_Woodwinds. They contain 12 files (4.15 GB), 14 files (4.35 GB), 29 files (12.6 GB), and 15 files (5.8 GB), respectively, which is a total of 70 files and ~27 GB. This is on the order of one half of the DVD installation contents. The file names within each folder include the type of instrument (e.g. SE_Volume-1_Brass_01.dat), which is significant for reasons explained below.
On the right-hand side of my disks, the following are listed: Woodwinds, Brass, Strings, Percussion, Keyboard Instruments, and Guitars. Below these, the words "Standard Library" and "Extended Library" are listed.
Could the difference between my DVD and downloaded installations be my disks include an Extended Library, which contains Keyboard Instruments and Guitars? If so, is this Extended Library available for download, too (in case something happens to my disks)?
I'm also wondering, is it safe to run the downloadable Special Edition Library update, "00_SpecialEdition_LibUpdate_2011-11-13"? If it replaced various DAT files based on the file names alone, it probably won't work correctly since the DVD and downloadable libraries produce files with very different names, even if the content overlaps.
If it matters, I checked my license keys and I don't see any that refers to an Extended Library, just "Special Edition-Vol 1" (as well as other VSL software such as VI Pro, Ensemble Pro, etc.)
Richard