The project importing logic can automatically handle the most common settings (device type, list of sources/headers, include directories, preprocessor macros, libraries, scatter file). If your project is considerably more complex, it may indeed require manual adjustment after importing.
There are 2 ways to address it:
- You can try creating a new project from scratch as shown in this tutorial, and compare it against the broken one.
- You can try following this tutorial to compare the build command lines between the original Keil project and the imported project.
If you prefer, we can compare the projects for you over a screen sharing session, and fix all the issues, however we would have to charge our consulting rate for it, since it is not something that can be done fully automatically.