Time, like an ever-rolling stream, bears all its sons away. The son in question is the iLok 1.
From June 1st 2018, you will no longer be able to use iLok 1 to authorize your Softube plug-ins.
Don't worry though, your licenses will still be there. You'll simply need to transfer them to an iLok 2 or iLok 3, or better yet - to your computer itself. Machine-based licenses require no dongle at all, and Softube licenses allow two auhtorizations (three for Console 1), so you can easily have your favorite plug-ins installed in more than one place.