I am in the market for Win10 Home edition 64-bit for a desktop I am building for my son. In searching the internet, most sites are selling full/OEM versions that appear to be boxed with a DVD for $90+ these days. But, there are a few sites that are selling "instant download" versions of Win 10 Home 32 and 64-bit versions for less than $50. It appears that the download can be saved to a USB or burned to a DVD for long-term keeping. Are these websites legitimate and selling legitimate Win 10 products and keys? I chatted with one of the cust. service people on a site, and, of course, they said it could be downloaded and saved, just like I mentioned. This almost seems too good to be true. Any thoughts please? Thanks.