WPListCal is no longer under active development. I just don’t have the time anymore to dedicate to the project. If you’re interested in taking on ownership of the project, please let me know in the comments below.
My apologies, but I won’t be able to provide support via comments either. I’ll try to keep up with moderation though, so if you can answer someone’s question, please feel free.
For more information about the project including documentation and download links, please see the plugin homepage.