Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Discussion and questions about Cumulus weather station software version 1. This section is the main place to get help with Cumulus 1 software developed by Steve Loft that ceased development in November 2014.
Like all of the web images, the moon file is just a 'grab' of the image in Cumulus. It's produced by a third-party Delphi component, and there's no option to change the background colour in the component. To change the colour, you would have to process the image yourself somehow, or use an image from a different source.