Nothing worked for me, spent 2 hours on the phone yesterday with TT customer service. She told me to call Microsoft. Based on one commenter from several months ago, I turned off VIPRE and TT updated successfully. Turned antivirus back on immediately after update. Like others, I've used TT for 10+ years without this update issue (I've had VIPRE installed for 3+ years too). TT, please fix this before next year's software!
