Epic Games Launcher Doesn't Work

Brand new Windows computer with all compatible hardware. Excited to download and install Unreal. However, the launcher doesn’t work for me. All I get when I run it is this image:

Nothing happens. I’m not prompted to sign in, and even when I do, the blue “download launcher” button is still on the top right where the install button for Unreal should be, according to the installation video. What can I do to fix this? Or, is there an alternate way to install the software? Thanks for your help!