Also, why did you write it will cost 250 to install it? I would be guessing why.
Here's the last chance free upgrade offer and how by CNET.
Read https://www.cnet.com/how-to/microsoft-windows-10-free-upgrade-offer-assistive-features/
By delaying you are going to make this cost even more.
Need opinion. I have a dell inspiron 660 i15 8GB ram 64 bit 1T hard drive purchased 9/29/13. I should have gotten windows 10 when it was free but was afraid to as this is my main computer. Should I pay to get windows 10 on this computer or buy one. I hate to buy a one as my hard drive is not even a fourth full. It would cost me $250 to install on this computer. It's just by 1-14-18 I won't have a choice anymore. I am not going to make a decision until January or Feburary of 2018. You can tell I think in advance which is good and bad. I value the opinions I have received on cnet. Thank you in advance