OK, so I'm no geek. But I downloaded The Unarchiver from the Apps Store - and even tossed in a donation because, heck, a person should be paid for his hard work. And up it pops on my screen saying that I have to choose an application to open it - making no suggestions, mind you! Huh? What? I looked in Utilities, wondering if there was something there that would work, but I'm leery of messing up my computer, so I closed Utilities - and The Unarchiver had simply vanished. It's not in Downloads. Finder can't find it.
Guess I should have seen if I could even open it, before I paid for it. Can anyone help me?