Procedure
1) Download the respective online installer according to you system type and product you want to install from below links
x86
http://download.bitdefender.com/windows/de...llerpackage.exe
http://download.bitdefender.com/windows/de...llerpackage.exe
http://download.bitdefender.com/windows/de...llerpackage.exe
x64
http://download.bitdefender.com/windows/de...llerpackage.exe
http://download.bitdefender.com/windows/de...llerpackage.exe
http://download.bitdefender.com/windows/de...llerpackage.exe
2) Extract the file "installerpackage.exe" with some compression software e.g 7-zip etc. It will create a folder named "installerpackage".
3) Now locate the file "installer.exe" and Run it as Administrator.
4) Now follow the On-Screen instruction in order to proceed the installation process.
Note: These links are given by our friend Rampant. Thanks to him. 
Offline kits are not known yet.