Can you leave an OS on a PC you're selling?

[made this just to ask this]

So i'm building a PC and I have windows 10 on a disc and i was wondering if i could sell the disc with the PC or if that was illegal. I didn't buy it but rather just got it off of their website and downloaded and burned it onto a CD and honestly i don't even know if what i downloaded was windows 10 or just something that'll let me put the product key in. Thank you in advance.

 

[USAFRet]

So i'm building a PC and I have windows 10 on a disc and i was wondering if i could sell the disc with the PC or if that was illegal. I didn't buy it but rather just got it off of their website and downloaded and burned it onto a CD and honestly i don't even know if what i downloaded was windows 10 or just something that'll let me put the product key in. Thank you in advance.

Is the OS installed and "activated" ? It seems not.

What DID you download?

Do you actually know what you're doing?
What are you selling? And for how much?

 

[USAFRet]

Did you pay any money for this thing you've downloaded?
If so, to whom?

 

[made this just to ask this]

This is what im selling http://pcpartpicker.com/p/GHc3f7
I'm selling it for roughly 350 an extra 100 dollars as people have said i should add an extra 100 for putting it together
This is what I downloaded https://www.microsoft.com/en-us/software-download/windows10
The OS is not installed or activated as i have just now bought the parts and they are currently being shipped.
And i did not pay any money as the download link for whatever i downloaded was right there which i do not believe is the actual OS.

 

[USAFRet]

So no, you have no OS on this machine.
If you were to sell this with an OS, you would need to add another ~$100.

So...a $250 PC. Do you have a buyer for this thing?
Adding $100 labor on a $250 PC is a bit extreme.

 

[made this just to ask this]

So no, you have no OS on this machine.
If you were to sell this with an OS, you would need to add another ~$100.

So...a $250 PC. Do you have a buyer for this thing?
Adding $100 labor on a $250 PC is a bit extreme.

No I currently don't have a buyer hoping I can find one on Craigslist or ebay. Yeah I was also thinking 100 was quite a bit for building it, was just told that 100 is a good price but I'll see. Thank you