Accessing Developer Apps in 1.8

I've heard mention of developer apps being unlocked using config.ini file - however all the instructions I've found refer to older versions of AC and I am unable to find the relevant text in this file to amend. Can someone point me in the right direction of how to enable these? - specifically I'm after downforce info and have seen a 'wings app' which I would like to play around with.

Can anyone help?

Thanks in advance

Simon