Saving the Cookie pictured below seems to be preventing further Ad's at this stage...
Good catch, Craig
Mind you, saving that cookie had no effect one one system here, Ad's are still displayed everytime CCleaner is opened, and on another system Ad's aren't being display at all, with or without the cookie
The new update also replaced the AvastAdSDK in the registry which I've now stripped from two systems so far for further testing.