Matlab 2015b & 2018b activation

Hi, Currently we have installed matlab 2015b, we extended our license so now we can also install 2018b. Use-Option: Classroom - Concurrent Term: Perpetual. We want to keep 2015b and also install 2018b. As much i find out first i need to update our license manager to 11.14.1.2 What and how i need to edit license.dat file on server to keep active currently 2015b and also support activation of 2018b ?

[Rik]

Even if sometimes staff members look on this forum and post from time to time, the help on this forum is mostly provided by people who are doing this as a volunteer. Your question seems better suited to ask directly to Mathworks. You can contact support with the Contact Us button at the top of the page.