Install BS/BX + ABnet bundle :

• Same cache shared by Blaxxun & BS Contact
• Shortcuts on the desktop to swap between them :
  
  menu items swaps Blaxxun v5.1 to BS Contact
  and then BS version switch toggles v6.1 & 7.2.
• ABnet client bundled.
• Uninstaller provided (this one will ask if you may clear the VRML cache).


• Download install bs-bx disk_D v7.zip
  and then unzip it in the folder of your choice.
• Close all Internet Explorer opened windows.
• Go to the folder where you extracted the files and run install_D.cmd.
• To uninstall it you can use uninstall_D.cmd from install bs-bx disk_D v7.zip
  or either C:\Program Files\Contact3D\uninstall.cmd.
  
• The cache path is D:\VRMLcache\ by default, you may change it after
  in the BS contact tab properties.
  
  

This setup worked for me, but remember that if you use it that it is at your own risk.

You are advised to edit the *.cmd files with Notepad to verify this setup before using it.