I bought a computer from flea market and can't get in it to upgrade to windows 10

Nice to meet you, *****!

Do you see any errors when trying to upgrade?

Ok, I see

Please, follow the instructions below:

1. Press Windows Key + I on Desktop, In the PC Settings window click Accounts
2. Now in the right pane of this screen, you'll see the Microsoft account you're linked to.
3. Click Disconnect, it will ask you to create a local account instead.
4. Now follow the on-screen instructions and create the local account.

Its an i

Are you at the lock screen now?

Ok, got it
Can you send me the picture of your screen, please?

It is not your account, correct?

Ok, I got you

Thank you

I see, thank you

Are you able to contact the seller somehow?

It is the best decision then. Contact the seller and ask him about the password. After you unlock the laptop, you will be able to remove this user

They don't have what?

Oh, I see

Please, follow the instructions below:

1. Click on the power icon at the bottom right corner
2. Press and hold the Shift key
3. Select restart. Hold the Shift key until the computer restarts to the blue screen

Keep me updated

Do you see the search bar there?

Please, type "Reinstall". When the search results appear click on the Settings category "remove everything and reinstall Windows"

Tell me when you find it

I’m glad I was able to get that sorted out for you. Is there anything else I can assist you with today?