I have installed Kali Linux old version 2.0 .But as Kali has shutdown all the updates and upgrades provided to the server I can't even update or upgrade thru my terminal commands such as get update and all......I have downloaded the latest Kali Linux and flashed it to my own drive so my pendrive is ready to install the latest Kali Linux....But I fear that my bootloader may not get erased during this process....So will it get erased if I tried to install Kali Linux 2016.2 over Kali Linux 2.0 or what are the steps I should follow to avoid any further problems to my PC....As I don't have the CD of my windows so I can't run Windows repair if anything goes wrong....

P.S- I have dual booted my PC with Windows 7 and Kali 2.0