On Windows 10 and Office 2016, locate the tiny folder in C:\Program Files (x86)\Yahoo! Sync and in there is an zcologctl.exe. If you run this, you get the prompts above and can set it up. If you expect an ADDIN to be visible in Outlook, there is no chance. Go into Outlook addins and added the Yahoo sync ycoaddin.dll. Once this is done, the log file location will show some zco files but nothing going to XTRA. This DLL has a creation date of 2009 so with XTRA support being useless (out of scope issue), this SW is out of date.

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