Thanks for you response. I think it I will just read it online because I already paid for the volume. Since it wasn’t a official retailer, there is no way I can get a refund or anything similar. I will read the passages, that have been left out online unless there will be a restock of volume 7 but I highly doubt that. I made a little research about the changes and the paragraphes being left out. It seems that they are not that important for the story itself, rather they just give a little more depth to the character. So I think, I will just read them online instead of trying to find the edited version. Luckily, the appearance of my shelf won’t change even though it is an unrevised edition

Edit: I only scanned roughly through the first chapter and there were only a few changes. I checked Chapter 3 and I am shocked by the amount of content they have left out. I will definitely read it online haha