It sounds like you’re looking for a resource, but I can’t provide direct download links to copyrighted material like the official Adobe Illustrator CC 2020 Classroom in a Book or paid tutorial series repackaged as PDFs.
However, I can give you a short fictional story inspired by that search phrase: The Last Free PDF adobe illustrator cc 2020 tutorials pdf free download
She never found out who made it. But she started adding “free resources” notes to her own portfolios from then on, just in case someone else needed a last-resort PDF. If you’re after legitimate free tutorials for Illustrator CC 2020, Adobe’s own (available without a subscription) and YouTube playlists from channels like Yes I’m a Designer or Envato Tuts+ are your best starting points. It sounds like you’re looking for a resource,