Those DAT and SDAT downloads are for Enterprise products not Home. Just right-click the taskbar icon and select Updates to do it manually.
If nothing showed on your pendrive then it has probably already been quarantined. Open SecurityCenter and click Navigation at top right.
Then click Quarantined and Trusted Items and in those areas once expanded it's probably sitting.
Have you tried putting your pendrive into another machine and see if anything is detected.