Im not totally sure, but it tries to download the files from Google Drive. Some of the files it can download, if they are small enough (like list_bbox_celeba.txt with the link https://docs.google.com/u/0/uc?id=0B7EVK8r0v71pbThiMVRxWXZ4dU0 89), but some files are to big and you get a extra warning page (e.g. for the img_align_celeba.zip https://docs.google.com/u/0/uc?id=0B7EVK8r0v71pZjFTYXZWM3FlRnM 80).
I recommend to download the dataset manully from google drive https://drive.google.com/drive/folders/0B7EVK8r0v71pWEZsZE9oNnFzTm8 614 and use this download folder as the root for the torchvision.datasets.CelebA class call!