With yesterday’s update there has been an issue with the automatic update system. This issue should be resolved now (Thanks to Révo).
You can manually update Emulicious now by manually downloading the latest files from this website and extracting the contents of the zip archive into your Emulicious directory, or via Emulicious’s update system.
You can manually update Emulicious by selecting Configure Updates in Emulicious’s Help menu then clicking the Check Updates button then clicking the Update Now button.
Sorry for any inconvinience this has caused.