ShaNexxx, if you followed the steps in the video, there will be nothing left to migrate… all is already there. To have a calm , you need to play with the blueprint settings. Go to the Manger section inside BP_Ocean. There you have setting to change wave direction, to change the wave speed and to change wave amplitude. Try 0.6 for speed and 0.7 for Amplitude and see the results.
For the missing .dll, again, doing the build as told in the video would compile and generate all the necessary dlls, so again, repeat the procedures, your results must end the same way or something is missing in your Unreal installation or Visual Studio installation.