Can not drag the app into the Application folder
I downloaded Grammarly for macOS from the website earlier. It can be downloaded into the desktop but when I clicked on it, it said drag Grammarly into the Application folder to install. So I did what it said. I dragged it into the folder, and I clicked on it. It said the same thing again. It just keeps saying "drag Grammarly to application folder to install" no matter how many times I dragged it into the folder.
MacBook Air, macOS High Sierra (10.13.2), null