It appears Amazon currently holds the streaming rights. Probably locked it up before D+ was even a twinkle in someone's eye. Amazon.com
The direct download for One Piece episode 1039 from the source you mentioned isn't available through authorized channels. However, you can officially stream or download the episode for offline viewing through several licensed platforms. Official Platforms for One Piece Episode 1039 Amazon.com Download [Shahiid anime One Piece 1039 (1080p) mp4