For downloaded files, by default, it should be in your Downloads folder, which you can head to in File Explorer, find the files, locate it, and select it, use Ctrl +C to copy it, then go to the folder you want to move it to, use Ctrl+V to paste it.
As for scanned files, it would really depend. Not all softwares save to the same folder. But some common locations to look for is Pictures\scan, or Documents\scan, see if you can find them there.