Hi @zuoseven ,
Cloudera recently changed the download policy for legacy CDH binaries and now to download software such as CDH 6.3.3 from Cloudera you need a valid subscription.
Please see the announcement here: Transition to private repositories for CDH, HDP and HDF
Toward the end of that announcement, you will see a section titled Instructions for CDH Customers with hyperlinks to further documentation which explains the credentials and how to properly obtain them if you don't have them already.
If you don't need that specific version of CDH and are just interested in personally learning a data platform, you may still download a Trial Version of CDP Private Cloud.
Bill Brooks, Community Moderator
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