Many qt4/kde4 packages was removed from repos and AUR, and every system update can brake Amarok. But I 'm using Amarok for a 6 years and I don’t want to lose Amarok’s statistic and ratings of tracks. I exclude Amarok with deps from system file hierarchy for guaranteed working condition.
Just get archive, create folder “app” in your home directory, and unpack archive to the folder. Click “app-run” to launch Amarok. After first launch you can start Amarok via icon in a main menu as usual.
P.S. If you don’t trust my archive, you can see which packages I put to “deps” folder, and put them from your system
$ ls -1 attica-qt4-0.4.2-4 exiv2-0.26-2 gpgme-1.11.1-2 kdebase-runtime-17.08.3-4 kdelibs-4.14.38-4 libcanberra-0.30+2+gc0620e4-1 libcanberra-gstreamer-0.30+2+gc0620e4-1 libcanberra-pulse-0.30+2+gc0620e4-1 libdbusmenu-qt4-0.9.3+16.04.20160218-1 liblastfm-qt4-1.0.9-3 libofa-0.9.3-7 libssh-0.8.2-1 oxygen-icons-1:5.50.0-1 phonon-qt4-4.10.1-3 phonon-qt4-gstreamer-4.9.0-4 polkit-qt4-0.112.0+git20180107-1 qjson-0.9.0-1 qt4-4.8.7-25 qtscriptgenerator-0.2.0-5 smbclient-4.8.5-1 taglib-extras-1.0.1-5