It's simple: first delete everything and download everything again. Install the "DOC APK," open it, and wait until you get the "missing obb file" error (this is so the game creates the folder where you'll paste the obb file). Then, take the file ending in ".obb" (it's the seventh file shown in the image), go to the Android folder, then to the obb folder, and look for a folder with a name related to the game, for example, the word "doc."
I hope this solves your problem.

