Heya @Steve Hofstra. There was recently an update to the HDF sandbox (v3.1.0), which changed what all services were included. As a result, some tutorials that pointed to HDFS, HBase, etc on HDF (pre-v3.1.0), had to be updated. I think most of them are, but there may be a couple still in the works that assume a pre-v3.1.0 sandbox (they may say they require some particular version on the tutorial itself).
Hope that helps!