Here the announcement:
Mageia 6 End of Life – Time to UpgradeAs you know, Mageia 7 was released this summer, followed shortly after by Mageia 7.1. It is time to say goodbye to Mageia 6 – updates have stopped, including security updates.
As usual, before the upgrade, do a backup of your data and documents.
You have a couple of ways to install Mageia 7:
1. Do a clean installation from Classical or Live media. In this case, you will keep the data in your /home if it is in a separate partition, as is usually the case – but do check! The root partition will be formatted during the installation process.
2. Upgrade from the command line, as described in our release notes.
3. Upgrade through the applet in the system tray. This option was disabled until recently as conflicts prevented the upgrade from completing successfully. These have been resolved, so you will now be offered an upgrade when you next update your Mageia 6 system.
Whichever method you choose, we highly recommend that you upgrade your system, as Mageia 6 is no longer supported and is no longer receiving any security updates.
Upgrading from Mageia 6