This plugin stopped working after 4.3.1 update.
We tried to use in http://www.diariomotor.com in companion with "XML Sitemap Generator for WordPress" (for main xml sitemap) and the news sitemap is completely empty.
Until now we were using "Google News Sitemap Generator" but the xml template is not valid right now, Webmaster Tools shows several errors in the news sitemap processing.
Would be soon available the next version of your plugin, compatible up to WP 4.3?
Thank you in advance!