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Unfortunately, I'm facing a problem/bug that stopps to continue:

I'm before Magus' Castle of Crows, Questmarker/arrow directs to the door to enter it.
Inside find 2nd body of Magnus, I loot all, find the other journal.
But nithing more happens, the questmarker now points still to the entranc door and in opposite there is a dark Doorway arch that I can*t pass.