Install kali linux 2020.1

download https://cdimage.kali.org/kali-2020.1/

install offline kali linux 2020.1 ( make usb bootable first )

then boot your computer using this usb bootable media

In my thinkpad edge 330 ( laptop ) , there was a problem with the wifi & desktop manager,
so i use this step :

1. add the repository list :
add /etc/apt/sources.list
 deb http://http.kali.org/kali kali-rolling main non-free contrib

 deb http://http.kali.org/kali kali-last-snapshot main non-free contrib
 deb http://http.kali.org/kali kali-experimental main non-free contrib

2. install the xorg and firmware wifi
apt-get update
apt-get install xinit xorg
apt-get install firmware-iwlwifi