Maybe just follow their Twitter account (https://twitter.com/desolation_mod) or Youtube account (https://www.youtube.com/embersparkgames) ?

I've never used it, but there's a Follow button on their linked site: https://www.moddb.com/mods/desolation and there's an RSS feed for news updates: https://rss.moddb.com/mods/desolation/articles/feed/rss.xml