Changing world. Used to be I bought a manual for any car I owned. My son doesn't own a single manual, he does most of his own repairs. Some manuals are available for download, generally not legal.
As I understand it erWin is top shelf product. There will be multitudes of downloads. Looks like it's designed to use on demand, on line. Like you, I'd want it all sitting on my hard drive, so you'll just have to look at the list. You'll want most of the sections cause who knows what you'll run into.
Correction. Cheep economy cars and low quality every day cars dont have service manuals like they used to and most are pay per subscriber base bs. Not porsche. You can still buy the service manuals in colour and much better then they used to be, same with any high end car. You dont want to know how bad Bentley and the like are, you cant even afford the book let along a door handle or headlight for them sobs
My old Bentley was full of red corrections, not very good, best we had, gone for newer models.
Check your local library, my library shows AllData OnLine, though I didn't try to access it.
Having to pay for secret codes, part no. access, repair information is some real bull stuff.