Glad to see you got it working, obviously the first file was a corrupt download.
Yes, you'll find it is quite addictive and certainly adds to the immersion/enjoyment. I've modified some of the commands such as;
"up/down scope" instead of "raise attack periscope"
"come left/right xx degrees" instead of "change course...."
"make your depth xx feet" - this one is a little weird in that when I say "make your depth 200 feet" the XO will respond with "new depth, 199 feet". He's always one foot off, LOL. Not sure why but no biggie.
It's a pretty versatile program so if you have a particular way of saying a command it's pretty easy to insert it into the command list.
Good hunting.