I have Microsoft office 2011 (acquired from a friend) (but only use word and excel) installed and working on my Mac running with Mojave. I'd like to update that to Catalina. BUT, when starting the download, it warns that office (among others will not work afterwards). I cannot risk being without these. I've looked at Apache Open office, but I'm weary of downloading something that is not what it purports to be. If I do install that is it as good as the Microsoft option? Where is the best site to download from? I don't want to buy office outright or pay a monthly subscription.any pointers will be much appreciated.