To transfer a file or video PC film download requires no extra software.
Simply copy that file to your USB thumb drive and you are done.
--> HOWEVER very few "standard DVD player"s can play from USB thumbdrives. And those that do require the video to be formatted according to that maker's spec.
The answer is none for both the transfer and which software. It has to be "none" because of the what you asked!
software required to transfer PC film downloads to USB thumb drive which will then play on a standard DVD player. I tried RealZeal but that only converts to DVD discs