Connect Outlook 2013 to Sharepoint 2010 External List fails

Clicking Connect to Outlook in a SharePoint 2010 external list (ECT) produces the following message:
"The Microsoft Common Language Runtime 3.5 is not installed on this computer."
The client is Office 2013 Pro Plus 32-bit on Windows 8.1 64-bit with a standard installation including BCS. .Net 3.5 has been installed from Turn Windows features on or off.
On Windows 7 and Outlook 2013, clicking Connect to Outlook results in the usual running of the .vsto, but nothing happens in Outlook (SharePoint External Lists does not appear). Outlook 2010 on Windows 7 works correctly. Connecting to a standard SharePoint
contact list from Outlook 2013/Windows 8.1 works as well. Offline Synchronization for External Lists is enabled for the farm and the site.

Hi Canadian,
To synchronize external data with Office products, you must have Windows 7 or later and the following free software products: SQL Server Compact 4.0, .NET Framework 4, and WCF Data Services 5.0 for OData V3 on each client computer (If necessary, you are
automatically prompted to download the software).
Please also make sure that you select Contact, Task, Appointment or Post as the Office Item Type for the external content type and Offline Sync for external list is set to Yes when you creating the external content type.
More references:
https://support.office.com/en-us/article/Connect-an-external-list-to-Outlook-9f00540e-a6b8-4510-9ce1-c79e31cbc8c9?ui=en-US&rs=en-US&ad=US
http://msdn.microsoft.com/en-us/library/office/ee557357(v=office.14).aspx
Best regards.
Thanks
Victoria Xia
TechNet Community Support

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