OMG, I'm sorry guys. I forgot to remove the embedded license key before making the 1.0.0 release.
I just uploaded 1.0.1, and it should all be working again.
You can either download it directly from the dashboard, or use the normal update mechanism inside WordPress admin.
If you don't see an update notice inside WP admin, deactivate and activate the plugin once so that new update information is fetched.
Migrations to new systems are hard :/, Sorry for the inconvenience!