We were somewhat confused with smartermail forum on the topic of ClamAV updating in SmarterMail. Here are my observations. This solution is only based on my personal observation, which cured 4 different smartmail servers with the problem of not showing the ClamAv updates correctly. One could see they were being downloaded to the server.

They are located in the default install path: C:\Program Files\SmarterTools\SmarterMail\Service\Clam\share\clamav the date in the admin interface was the same date as the file 'daily.cvd'. I renamed the file to daily.cvd.bak and restarted smartermail service and a new file was created and the interface reflected the new date.