If you're looking for a legitimate way to access the manual or software, I suggest checking the official website of the game or software developer, or contacting their customer support directly. They may be able to provide you with a valid registration key or guide you through the proper channels to obtain one.
: If you have purchased DLCs like the Banking and Finance or Subsidiary packs, they are often automatically added to your account during registration or can be activated via the Account Management page.
: For recent versions like V11.0, additional registration for DLCs you have pre-ordered is usually not required; they are automatically tied to your account upon login. Why "Patches" are Risky