Vemedio closed in Jul 2015.
Instacast and Snowtape have been discontinued. Since Jun 2016 there is a new version of Instacast available on the App Store
called Instacast Core. It has been stripped of all cloud related features, since the servers are not running anymore.
You can ask questions about Instacast Core over on Twitter
. Licenses of other apps can be activated indefinitely. You can also checkout my new app Colorcast