thank you for your question - we will be publishing a complete Q&A document based on last week's Webinar Recording: Aurea CRM Solutions Latest Mobility Innovation [EN]
Meanwhile, here's the answer you are looking for:
Which Aurea CRM version is required to use CRM.client?
CRM.client is designed to use the same CRM.designer configurations as well as the same Mobile Services DLL CRM.pad requires.
Hence, it can be used starting with Aurea CRM v9.