If one wants to get it from there I'd recommend either the 6.2 MB PDF of the 6th printing, or the 8.0 MB PDF that doesn't state the printing in the description, but is the only 8.0 MB PDF.
Both of those are searchable PDFs, and pretty good scan quality. The 8.0 MB one has the best scan quality, although the pages are a little yellowed which might be a bit annoying.
The 8.0 MB one is actually just a copy of the Internet Archive's scan, which is available for borrowing directly from the IA [1].
There's a 3.9 MB PDF but the scan quality is noticeably worse than the others and it is not searchable [2].
I've got a searchable PDF I made myself from my physical copy of the book using a CZUR ET24 Pro. The IA scan text is little better, but not by much, and their file is a little smaller (mine is 9.1 MB), but overall I like my scan more. I've been quite impressed with the CZUR scanner.
[2] By "not searchable" I mean it doesn't appear to have text information included to allow for fast search. Some PDF readers can still search it but I think they may do their own OCR on it to do so, and that takes a while. The ones I've said are searchable can search the whole document almost instantly.
