You can download official ISO file of Kali 2.0 from Kali Linux website and install it as you install previous versions of kali but if you do not want to lose your installed programs and data then you can upgrade your old kali Linux 1.x to Kali Linux Sana.
When you do this upgrade it is possible that you may get some errors and do not able to upgrade it fully. This video will show you how to upgrade to kali Linux Sana without any errors.
Here is the Repositories that I use to upgrade
leafpad /etc/apt/sources.list
# Regular repositories
deb http://http.kali.org/kali sana main non-free contrib
deb http://security.kali.org/kali-security sana/updates main contrib non-free
# Source repositories
deb-src http://http.kali.org/kali sana main non-free contrib
deb-src http://security.kali.org/kali-security sana/updates main contrib non-free
apt-get update
apt-get dist-upgrade
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