alt.********.**.*****.**** is a News-Group. To acess this News-Group contact your ISP "Internet Service Provider" and ask them for your local News-Server which should be something like news.central.comcast.net. Once you have you News-Server download a prgram called GrabIt, which can be found here http://www.shemes.com/grabit/. When you first run this program for the first time it will ask you to enter your News-Server which in my case would be news.central.comcast.net. Then Click O.K. Next click on "All Groups" and then click on "Update List". Then after this is done their should be a list of all the News-Groups, scroll down till you reach alt.whatever.whatever then right click,subscribe. Then highlight the group on the Left Hand Side and click on "Update Group". To download them right click on the file and click on GrabIt. If you would like to watch your files download click on "Batch".
NOTE: There are alot of other News Programs you can use to download stuff. GrabIt is what I think is personally the best though. GOOD LUCK!
MOD EDIT: Removed all potential for piracy. General newsgroup FAQ.