i believe you have to change a vers number in a .txt file for the saves from .15 to .17.
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running vers 1.12.2 and can't talk to the trader guy in Gear shop, Vibrosuit, jacket and underwear doesn't appear to be repairable (tried in vers 1.12.1, could try paying for repairs, but wasn't able to, even with more than enough cash), plus can't get down to Sub-level 2 after unlocking the mission for it?
Most of the stuff is either hidden, or supposed to be combined from other stuff (The diary is in the master bedroom safe, in the closet. Use a sheet of paper from the office, and a pencil on a book in the master bedroom.)