I have avast free 4.8 and never did get notice of the new 5.0 version until now, when I get a popup screen saying my subscription ends soon (even though it doesn't expire in 3 months). But at the bottom it has the option to click "install" for the new version. If i do that, will it install ok over the 4.8 version or will it cause problems without first uninstalling 4.8? Thanks