List of best mirrors for IP address 18.191.28.200, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/multiarch/pool/main/q/qt3d-opensource-src/libqt53dextras5_5.15.8+dfsg-2+rpi1_arm64.deb