You may see a message while updating QuickBooks:
Accessed file is infected. Threat was blocked! File name: qb20bgocdsp.quickbooks.com/ud/14935
This false positive is not uncommon with Anti-Virus or Security software. This appears to be tied to a prior AVG update. AVG has resolved the issue and you can fix this by downloading and installing the latest AVG update.
Solution 1: Update AVG
AVG has resolved this issue in their latest update.
If updating AVG does not resolve the issue, perform the steps in solution 2.
Solution 2: Add exceptions for the QuickBooks update application (qbupdate.exe) and the download URL to your AVG Software