....from Sygic support (Lollipop problem) :
" Hello, please uninstall the application via the Android application manager and delete the Sygic folder from the memory of your device. After this is done, try to install it again from Play Store. If the issue continues please contact us at: [Only registered and activated users can see links. ] for proper support. Robert from Customer Care Team. "
..... Usual advice...... that not working then !