When trying to download btmgr, hitting Download eventually gets one to a screen where you are invited to view files before downloading, but which itself has no Download button! The individual files displayed appear live but surely we aren't meant to download them individually, when we want the app. package?
sbminst.exe is the complete installer
user-guide-3.7.tgz contains the full user guide
btw ... another link of intrest:
not to webmaster ... make that the default web page