A:AnswerChristopher,
Microsoft has elected with Windows 10 to move away from physical media, so the system does not come with a physical copy. However, Microsoft has made the image available through their website for all re installation/repair needs.
Thank you,
A:AnswerToast,
The system does fully support adding more RAM, but in the current configuration, all available slots are full, so you would need to swap out all the RAM for higher capacity dimms.
Thank you,
A:AnswerSebastian,
The mouse and keyboard are a Logitech pair, though that is subject to change. As for the RAM, at this time, the system utilizes DDR4-2400Mhz.
Thank you,