Hi, good day! I'm John DeV a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
Are you creating USB Installation media of Windows? Sorry, you can't do this if you just download it from your phone to a flash drive.
The best option to accomplish this is to find another working computer then download the Media Creation tool (Click Download tool now). Use the tool to "Create installation media (USB flash drive at least 8GB in size) to install Windows 10". Instructions inside the link.
Note: Please make sure to uncheck the "Use the recommended options for this PC" box.
https://www.microsoft.com/en-us/software-downlo...
Please try checking the link below for more details.
https://www.tenforums.com/tutorials/2376-create...
Kindly let me know if this helps or if you have any further concerns.
Kind regards,
John DeV
Independent Advisor
Standard Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.