I actually downloaded mine from the site techinfo.subaru.com These are also in .pdf format with ambiguous filenames. It actually made it hard to download them because I did not have an easy way to reference where my last download ended and where the next should begin.
The manual is broken down into sections, engine, body, powertrain, etc. Then there are sub-sections there such as fuel-injection, engine lubrication, etc. What I did when I was downloading was create a folder hierarchy to match the layout on the web site to sort my files into sections. I still have the ambiguous filename problem. So at this point I am looking at going back through the website and rename each file to reflect what it is for. That is quite a project, because the complete manual I have is nearly 500 files.
For now, a lot of the sections have only a dozen or so files, so once I am in the folder for the section I need, it is a matter of searching through a dozen or so files to find the one I need.
I am thinking of offering my CD on EBay or perhaps a different way as well after I get it all finished. I have the complete manual for 1996 Impreza. Any thoughts on this?
I also did not see anything in the way of an index file on the site. You do have the option to buy all the .pdfs on CD for $199. I figured for 72 hours @ $20 mine was a steal. I got the entire '96 manual and 2/3 of the '93 in that amount of time.