The manual under "Additional Content" the library home page links to storefront.steampowered.com/Manuals/3830/Psycho%20PC%20Manual2.pdf?l=english&cc=us&oc=windows, which redirects to the Steam store homepage. The correct URL for the manual is cdn.akamai.steamstatic.com/steam/apps/3830/manuals/Psycho%20PC%20Manual%20(2).pdf