tsv501.zip is the main file for Tortured Souls.

TSv503.zip - TSv506.zip are patches for Tortured Souls.  Download it if 
you want to play Tortured Souls with the Big Picture.

TSv51.zip is an all-inclusive patch, encompassing v5.03 - v5.06.  Download 
it if you want to play Tortured Souls Stand-Alone.

TSv602.rar is the latest version in WeiDU format.