does anyone know where i can download the entire shas in a PDF format.
Edited to add link. How’s that for a change?
They definitely have all of shas but not sure if they have it in one download.
As a side note they have tons of seforim scanned in. Useful site.
Does Hebrewbooks publish historical Hebrew books from the Haskala?
Yes, but if it is called to their attention they remove it. So you have to act fast if you come across anything
dafyomi.org I think has download
You can also get .pdf files for the entire Soncino translation online, one file per tractate.
Koren also sells its English translation in .pdf form.