The message appears when OfficeScan is busy checking for possible updates. To successfully install the plug-ins, temporarily disable the OfficeScan updates.

1. Disable the server scheduled update.
   1. Log on to the OfficeScan server management console.
   2. Go to Updates > Server > Scheduled Update.
   3. Deselect the Enable Scheduled Update option.
   4. Click Save.
2. Disable Smart Protection Update.
   1. On the OfficeScan server management console, go to Administration > Smart Protection > Integrated Server.
      For OfficeScan 10.6 and below, go to Smart Protection > Integrated Server.
   2. Deselect the Enable Scheduled Updates option.
   3. Click Save.
3. Restart the following services:
   • OfficeScan Master Service
   • OfficeScan Plug-in Manager Service

   At this point, OfficeScan server should be downloading Trend Micro Security for Mac installer from the update source.

4. Go back to the Plug-in Manager page and download the installer for Trend Micro Security for Mac.
5. Once download is complete, restore configured update settings.