Just to help those out, you can overwrite the content of the latest broken upgrade files with the following old version code (0.5.4.3) I stored in a gist on github:
https://gist.github.com/mkormendy/5d7ca25b38ae8bbd265d
NOTES:
- a reminder that sunrise.php is found in the root of your wp-content folder
- I have changed the version code of the plugin to match the latest version (0.5.5) posted on Wordpress.org so that I am not bothered until a verified fix is available in a newer version
PS. I am in no way affiliated with this plugin or responsible for any damage to your system should something go wrong. However, the code is a byte for byte match to the old version code (0.5.4.3) aside from the version number change.
