I have recovered and am hosting the source code for version 3.4.2, the version prior to the Avast acquisition, on GitHub at the following

https://github.com/elgrove/idcac-3.4.2

I am not well versed in open source licensing but I believe the GPL3 gives me permission to do this. Please could someone more knowledgeable confirm this for me.

I am not a web developer, I'm hosting the code in the hope that someone else will take it and fork it. It's one of my favourite extensions and a day 1 install on any new machine, along with UBO