Yep, as you already found out, this is due to ORK's update policy changes. It'll probably take some time until Unity finished reviewing the new update to make the upgrade path from the previous asset to the new one available and allow you to download it.
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Oh wait, here it is.
https://assetstore.unity.com/packages/templates/systems/rpg-editor-ork-framework-2018-125912
http://orkframework.com/news/update-policy-changes/