Premiere Elements New User Issue

Hi, I've just bought Premiere Elements. My serial number is there on my Adobe account. When I click on the Premiere Elements app on my laptop it takes me through to the Dashboard / Workspace or whatever it's called. I then click on Video Editor. At this point it asks me to log in to my Adobe account. I enter my details and it says, "You're all set! You can now close this browser tab and go back to your application." But.... the application never opens. It's just a cycle of asking me for my login details then nothing. Any ideas? Any help gratefully received!