Can anyone please give me a step by step to install QT?

i have tried installing qt a number of times but it gives this error every time i installed vs 2015 compiler one version 5.8 It says“Error while building/deploying project Tutorial2 (kit: Desktop Qt 5.8.0 MSVC2015_64bit) When executing step “qmake" ” it gives this error for every code i run. i have tried re installing the vs 2015