Can you show the errors again?
That’s correct, but in order to build VST2.4 you need to put the vst2.x folder into the C:/SDKs/VST_SDK/VST3_SDK/pluginterfaces/ folder.
The 2019 build folder should be created when the Projucer is run. In fact, does the Projucer run OK? You can try launching it on its own and then opening the CabbageIDE.jucer project. Then hit the open in IDE button and it will launch the VS project. You can then build from inside VS.