The maintainer of the All-Time Best Doom Levels has moved on to other projects, and mail to this address is checked by the gamers.org webmaster on an irregular basis. No new levels will be added to the list, nor can the maintainer give any technical assistance with Doom games (he has deleted Doom).
If you have trouble downloading a level, it may be because the archive is busy. You should try one of the mirror sites. If you have trouble using a particular level, make sure you have the correct game and operating system for that level, and read the instructions. All levels listed here have been tested by the maintainer at some point. For any other problems, send email and we at gamers.org will help you as best we can..