Issue #8326 highlights the problem that sometimes the installation of the MS VCRT libraries required by Firebird 5 can require a reboot of windows. This can especially be a problem for deployment of scripted installs.

This option allows users to skip the installation of the MS VCRT runtimes. This is not a fix for #8326 but may provide a work around. If users use this option it becomes their responsibility to ensure that the runtimes are installed by another method.