The problem is indicated right above the red rectangles you have placed. You need to have also the appropriate compilers installed. Without compilers you cannot do anything in Qt creator with these versions. You have used two different qt creator versions, but it is the same issue, because you refer to the same qmake. BTW There is no Qt creator above 3.x out there. You are refering to the Qt lib versions Qt creator is shipped with. Qt creator is an independent IDE with independent version numbering. However, it is typically using the most recent Qt lib versions.