Novice installation problem, ask the great spirit! Downloaded QT5.9 began after installation, the installer to install the chosen msvc2015.32 bit, msvc2015.64 bit, bar under the selected Qt Creator 4.3.1 CDB Debugg... Then the next is according to the next, but run after installation is complete QT Creator into Tools - & gt; The Options to select the Build & amp; Run the Kits found inside Desktep QT 5.9.0 MSVC20015 32 bit and 64 bit this two bar is a red exclamation mark, can't use, ask everyone a great god, whether also need to install what just can Run! Thank you for your attention!