I use WinRAR 3.4 and 7Zip to compress files because they provide more compression than zip format. If you have some problem decompressing the files you can download 7Zip from www.7-zip.org for free.
You can find broken links, sorry. I'm using a free web hosting server that sometimes decides to delete some file :-( In that case send me a mail and I'll try to restore it.
I'm not working on USARSim anymore. I will leave the documentation already written on this web site but I will not add any further content.