Download Dnet v1.0.2.0 :
wget https://github.com/Darknet-Crypto/Darknet/releases/download/v1.0.2.0/DarkNet-1.0.2.0-Linux64.zip
I was following the upgrade guide and this file no longer exists on github.

Do I use something else now to upgrade?
The zip you mention was there about 2 hours ago.
Use these.