Paintshed comes built into TRS2006. The icon is in the file location: Auran/TRS2006/bin/TPS.
If TRS2006 Paintshed is defective, and has missing US Lang files, download and place the TRS2004 Paintshed at Gaurc:
http://gaurc.us/index_files/software.htm into the TRS2006 file location.
You will find Paintshed only paints Paintshed Templates cars and locos, and paints nothing else.
Only 21 more days until Auran unsupports TRS2004 & TRS2006