Because it seems there is still an interest in this, I am now releasing the source code for the programs I created all those years ago. They are distributed under the terms of the GPL (GNU General Public License). See the file called Copying inside the package for the exact terms.
Art (Gerard van Essen)
Here's the link to download the sources:
art_src.zip - 1.3 MB.
And here you can download key generators so you can create a key to make your timEd or Netmgr work in registered mode:
Key generators for timEd and NetMgr.
And here's a WP document with the original timEd docs:
Original Wp 5.0 file with timEd docs.