Update not possible. "Critical error: Validation of engine and VDF failed."

After reinstalling the AntiVir software from CD-ROM, or from an older installation file you had saved, an update error may occur. A message is displayed, saying that update is not possible. The last entry in the update logfile is: "Critical error: Validation of engine and VDF failed."

For the update to run correctly, you have to uninstall the AntiVir software from Control PanelAdd or Remove Software. Then please download the newest version from the Download section and install it using your license.

Affected products

  • Avira AntiVir Premium, Version 10 [Windows]
  • Avira AntiVir Professional, Version 10 [Windows]
  • Avira Premium Security Suite, Version 10 [Windows]
  • Created : Wednesday, May 7, 2008
  • Last updated: Monday, April 11, 2011
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