Here Are The World Trade Center Mod install links.
GTA IV 1.0.4.0
http://www.mediafire.com/file/56di2la22f8l63b/wtc035+1040+no-snow.rar
GTA IV 1.0.7.0
http://www.mediafire.com/file/si218d6v4nauh38/wtc035+1070+no-snow.rar
Traffic fix for WTC
http://www.mediafire.com/file/4ousc1ifqge864m/wtc+fix.rar