The spec file for kget 4.10.90 states that the package is GPL-2.0+ licensed.
The source files in the /transfer-plugins/mmsthreads/ subdirectory are GPL-3.0+
licensed. For example, dlgmms.cpp:

/*
    This file is part of the KDE project
    Copyright (C) 2011 Ernesto Rodriguez Ortiz <eortiz@uci.cu>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

Is it intended to package GPL-3.0+ plugins as part of an ostensibly GPL-2.0+ program - meaning that there is a danger that the entire program should be licensed under GPL-3.0+ rather than GPL-2.0+.

Reproducible: Always