Just a follow-up:  According to the Daz forums, the warning about the Bryce 7 was a "false positive," especially considering I bought some V4 content with about 35 .exe files and 34 of them had warnings of their own, but everything, including the Bryce, scanned clean for anything harmful and Avast has recently updated its downloader scanner stuff.

Everything scans clean and should have d/l clean if I did it now. :)