This is why you buy older but still supported versions for less than the new fake mini towers like the G5 8940 , OPTIPLEX 3070 3080 etc. OEM DVD reinstalls without issue. No difference between home or pro dvd.  $12 can be used on any dell from 2006 to now to reinstall. Licence key is in the bios. You install 7zip then download the driver cab file and move it to my documents.  You then right click the cab file in my documents and say extract here. [URL]   [URL] [URL] [URL]      
I now own 15 Dell PC's ( 12 business and three retail). I just purchased the new 3880 and I'm a little confused about a few things: I know this all sounds a little critical but I'm a big Dell fan and user just concerned about changes. I also know theirs other models like the Optiplex or Vostros ( which I also use), but I feel if your going to label a machine a tower it should fit the definition.  I have an older Dell 745 tower that, other than the more modern board, that has twice the quality and usefulness of the new 3880.
New Inspiron 3880 Mini-Tower - Many Questions