Hey there thanks or using Cosmos WordPress theme. First thing please don’t publish the le repository url here. Some hosting providers are not allowed to bulk install so you need to install them by one by. Our repository working properly but we removed the suppamenu in the theme. But if you need megamenu for the theme please check your email. We’ve sent the mega menu url toy you.
Also currentl you are using old version of te Cosmos WordPress theme I think. You need to update it via automatic updater.