It hasn't. 
When impulse finished downloading, it seemed to just stop the instalation process.
I tried deleting the temporary download folder for impulse next, but I STILL get the beta version installed!
Then tried uninstalling Entrenchment via the Add/Remove Programs, through Windows CP. I clicked on Entrenchment and nothing happened, so I'm assuming there's a registry issue as well?!?
Any ideas? Anyone? Please? 