Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
libQt5Designer.so.5()(64bit)
libQt5Designer.so.5(Qt_5)(64bit)
libQt5Designer.so.5(Qt_5.0)(64bit)
libQt5Designer.so.5(Qt_5.1)(64bit)
libQt5Designer.so.5(Qt_5.2)(64bit)
libQt5Designer.so.5(Qt_5.3)(64bit)
libQt5Designer.so.5(Qt_5.4)(64bit)
libQt5Designer.so.5(Qt_5.5)(64bit)
libQt5Designer.so.5(Qt_5.6)(64bit)
libQt5Designer.so.5(Qt_5.7)(64bit)
libQt5Designer.so.5(Qt_5.8)(64bit)
libQt5Designer.so.5(Qt_5.9)(64bit)
libQt5Designer.so.5(Qt_5_PRIVATE_API)(64bit)
qt5-qttools-libs-designer
qt5-qttools-libs-designer(x86-64)

Requires :

libQt5Widgets.so.5(Qt_5_PRIVATE_API)(64bit)
libc.so.6()(64bit)
libQt5Core.so.5(Qt_5.9)(64bit)
libQt5Core.so.5(Qt_5)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libQt5Gui.so.5()(64bit)
libQt5Widgets.so.5()(64bit)
qt5-qttools-common = 5.9.7-1.el7
rtld(GNU_HASH)
libstdc++.so.6()(64bit)
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libpthread.so.0()(64bit)
libQt5Xml.so.5()(64bit)
libGL.so.1()(64bit)
libQt5Core.so.5()(64bit)
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libstdc++.so.6(GLIBCXX_3.4)(64bit)
libm.so.6(GLIBC_2.2.5)(64bit)
libstdc++.so.6(CXXABI_1.3)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libm.so.6()(64bit)
rpmlib(PayloadIsXz) <= 5.2-1
libgcc_s.so.1()(64bit)
libQt5Xml.so.5(Qt_5)(64bit)
libQt5Widgets.so.5(Qt_5)(64bit)
libQt5Gui.so.5(Qt_5_PRIVATE_API)(64bit)
libQt5Gui.so.5(Qt_5)(64bit)
/sbin/ldconfig

Content of RPM :
/usr/lib64/cmake/Qt5Designer
/usr/lib64/libQt5Designer.so.5
/usr/lib64/libQt5Designer.so.5.9
/usr/lib64/libQt5Designer.so.5.9.7