If it's exe or zip you can download to USB drive and install it from there. What site are you using that is saying this only?

No web-site said it. When I installed the new Windows 7 on the computer affected the IE browser just will not access any web-site. I can't download Microsoft Edge because I can't go to the download web-site. There is no way I've seen to download Edge to a flash-drive so I thought if I could download Firefox to a flash-drive that would let me browse. I don't want to download Firefox to one of my other computers if I can't then transfer it via flash-drive to the computer involved.

I don't want to download Firefox to one of my other computers if I can't then transfer it via flash-drive to the computer involved.

You can download the full offline setup installer for Windows from https://www.mozilla.org/firefox/all/#product-desktop-release and you may need to select your preferred language in drop menu.

I solved the problem. I downloaded Firefox to another computer, then instead of opening the file I clicked to view it in folder. In "downloads" I clicked to "send" it to the flash-drive. It sends "without properties" but I decided to try that and it worked. Thanks for the efforts.