Qt installer error message during QtScript 5.5.1 installation

I'm coming from Qt5.4.2 and want to switch to 5.5.1. After executing the maintenance tool and installing the 5.5.1 binaries for MSVC2010 and MinGW_4.9.2 I've missed the deprecated but still available QtScript module. So, I've checked the maintenance tool again and I've seen that this module has to be selected separately. Hmm, there is no description which binaries I will get, I mean, for which toolchain...

There is only a tooltip that mentions "...prebuilt binaries for 64bit GCC..." Anyway, I've checked the QtScript module and start the installation. Then I can see the download of a QtScript package, but the installation process fails for both, MinGW and MSVC. See the screenshots below.

However, after pressing the ignore button the required QtScript and QtScriptTools libraries are installed nevertheless for both, MSVC and MinGW, our projects are running fine with it. So, it seems that the error message can be ignored.