Of course you'll continue to be able to update everything with the Live Updater but, in this case, we HAD to force to run the latest installer, because we made some changes in KORD V2 which require to have different files installed for V4 and V5, and create a different add-on.xml even for P3D V4, even if V4 is the only sim used.
The Live Update is not made to create or modify the add-on.xml, is only supposed to update files, since the add-on.xml creation is dealt by the installer, so there were any need for the Live Updater to ever do that.
So, to prevent you for just running the Live Update, and found out your KORD V2 stopped to work, because we moved a file in a different folder which your sim couldn't see until your add-on.xml was updated too, the only possible choice was to just write a message that, in order to continue with the updates, you must run the installer again.
Of course, now that you ran the new installer, the Live Update can continue to keep the scenery updated, as usual.
It's not as if every day a new version of the simulator comes out, and in this case, we took the chance to make an upgrade to KORD V2, using a new feature which is available in P3D V5 only, which are photoreal background in PBR, which are not possible with V4. That's why we had to split the scenery in two, since the photoreal background .BGL is compiled with the V5 SDK, so it cannot be used by V4.