Can't install Avast Antivirus
Hello, all - I received the attached message when trying to install Avast Antivirus. I'm wondering if Firefox might have beeen corrupted in some way, especially because I've downloaded Avast before with no problem. I followed the suggestion and installed it via the Opera browser, but Firefox is my default and I'm concerned. Has anyone had this experience and/or know what to do about it? Thanks much in advance, as always!