Here are some good links to download the Windows 10 Install files. You will usually need to be a technician to understand how to use these to upgrade your computer and you will need a valid windows license, but here they are for reference;
http://www.microsoft.com/en-us/software-download/techbench
https://www.reddit.com/r/Windows10/comments/3ee1gx/windows_10_10240_esd_download_here/