My husband’s Avast Pro is expiring and I would like to install Avast Free Antivirus on his computer. Is uninstalling Avast Pro and then installing Avast Free the best way to do this? If so, how do I uninstall Avast Pro? He is using Windows 10.
Uninstall Avast pro via control panel, when you start the uninstall it will offer the free version option. Take that 
Thank you. The fact that I could install the free version at the same place I uninstalled the Pro version made it very easy.