I use Avast and have done for years, yet I don't get any virus warnings from DAZ installers, so the big question is how are you downloading them?

BitRock installers were designed to be a major PITFA to bit torrent users, the multi threaded download system those programs use causes the installers to "throw up a flag", which makes an AV think there is a virus in the file. The problem is that the same can happen if you use a download manager or a 'fancy' browser downloader, as they also use the multi threaded download system.