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Regarding the Qt Creator question. It depends on why it is not running.
It may be failing to find the executable to run. Check your project configuration:
Screenshot_20201217_183703.jpg

It may be attempting to run the program, but the program does not find dependencies and terminates. You can set a library search path in the same area of the project configuration.

If all else fails try closing Qt Creator, removing the yourproject.pro.user file, and reimporting the PRO file into a new project.