What do you mean “image array problems”? There is logic in the Week 2 Logistic Regression notebook for loading the image dataset. Search the notebook for the function load_dataset.
There is no official documentation for how to do this. Note that the link Jonas gave above is a generic Coursera link and it doesn’t handle some aspects of the notebooks here (e.g. linux symlinks). Here’s a local thread about using “tar”. But there also appears to be a new download option provided by Coursera.