Ok, dataset download features are available only in radiant_mlhub version to 0.5.1 or 0.5.2 (recommended).

But I think it is a problem in Google Colab with pip . The version available in Google Colab is 0.4.1

"!pip install radiant_mlhub==0.5.2" shows:

ERROR: Could not find a version that satisfies the requirement radiant_mlhub==0.5.2 (from versions: 0.0.2, 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.2.0, 0.2.1, 0.2.2, 0.3.0, 0.3.1, 0.4.0, 0.4.1)
ERROR: No matching distribution found for radiant_mlhub==0.5.2