Open Candy comes with a few 'free' software programs; one I know is the quite well regarded and recommended CDBurnerXP. There's no option NOT to install Open Candy (something I hate) with the main program but, unless it has changed recently, thankfully you can easily remove Open Candy in the usual way or, better, with a software uninstaller like Revo.
The problem with Open Candy, apart from its existence in general, is that Malwarebytes and I suspect some other AV/AMs flag Open Candy as a PUP (which it is) and so the whole updater/ installer may be flagged and quarantined depending on your settings.
How the more recent AVAST versions respond to it I don't know. A Malwarebytes scan flags up all updater/installers I have with Open Candy included. AVAST doesn't block either the updater/installer download or report it as a PUP in any scan, at least not v.8 with the settings I use.