Then your install appears to be broken, Reinstall 5.54, you should get :
Aurora.exe, stevefire,mdb, and the following folders:
Flags, medals, Planetjpeg, races and ships.
Then install the 6.4 Patch, drop a11.jpg,m24,jpg and b20, jpg into the planetjpeg folder, flag0390,jpg and flag0391.jpg into the flags folder, and then overwrite the old aurora.exe and stevefire.mdb files.
Finally install the 6.43 patch: Overwrite Aurora.exe with the new copy.