Thank you @hskoglund for this option, it worked! This is the perfect solution for me, it's simple, and now I can use C++ variables for the install path of my DLL if needed. Thanks again!

Hi and welcome to the forums Yes it should run on most other windows 10 64 bit. Maybe even win 7. But there is no guarantee as such with brand new mega patches. A license would give you many benefits but it's not better to deploy as such.

@hskoglund said: Good! About your P.S. when you have done windeployqt on your .exe file, then every time after that, if you go into Qt Creator and edit/rebuild your program, then to be safe, you should run windeployqt again. yep, it's work! thank you!

The problem is solved, The problem was caused by the difference between Qt SDK compiler and application compiler ! I recompiled the src of qt sdk with the compiler used to my program and now it work ! thanx,