Random fail on RTA/opensource installer while installing Mac 5.0.2 binaries

Download the Qt opensource Mac online installer from http://download.qt-project.org/official_releases/online_installers/.
Start the installer and download Qt5.0.2 binaries for Mac.
Random fail on RTA tests (does not reproduce on every test run): see the verbose log:

fetching metadata of "qt.510.src" in version "5.1.0"
fetching metadata of "qt.510.clang_64.essentials" in version "5.1.0"
fetching metadata of "qt.510.clang_64.addons" in version "5.1.0"
fetching metadata of "qt.510.clang_64" in version "5.1.0"
fetching metadata of "qt.510" in version "1.0.0"
Could not open meta info archive: /var/folders/kp/_4z4_jyx5nx40bgs_61df01m0000gp/T/qt_temp.D20075. Error: No such file or directory
Could not open meta info archive: /var/folders/kp/_4z4_jyx5nx40bgs_61df01m0000gp/T/qt_temp.D20075. Error: No such file or directory
Control script callback "PackageManagerSelectedCallback" does not exist.