Once you have downloaded the new RC you might get the warning message.
Just click on the More info link
It will the open this panel, now click on the Run anyway to proceed to the installer.
Double click on the installer.
click on next to proceed to the license agreement.
Read the license agreement and then select the I accept the terms in the license and then click next.
Leave as the default directory or change it if you wish.
Once you have selected your directory click on the next buttom
this is your last chance to not install the software if you wish to proceed then click the Install button
The BMTv4-RC will now install and close.
To run the BMTv4-RC double click the icon on the desktop.