Was working with your accounting software and suddenly bumped into an error pop up stating “Your QuickBooks isn’t able to update because the downloaded file has been corrupted”. And can be seen at the time of updating the QuickBooks software.
To get a better insight into shunning off the QuickBooks payroll error 15106, then our blog would surely help you. You can also consult our technical support executives using our customer support helpline 1-800-761-1787.
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If you are dealing with QB or any other software solution then there are maximum chances that you at some point will have to deal with issues since none of the accounting solutions out there are free of issues. If you are dealing with the most common QuickBooks Update Error 15106 then you will just have to follow the below-mentioned steps to solve it;

First of all, you will have to login into QB as an administrator

Then you will have to verify whether there is any anti-virus running on your computer, for example, avast-antivirus

Now, you will have to move to the c:/Program Files/Intuit/QuickBooks/Components.

Then, change the name of the downloadqbxx folder for downloading downloadqbxx.old.

Now, finally, just reset the QB desktop update.

If the issue still persists even after following the above-mentioned steps then you will simply have to disable the antivirus.

Source: https://www.cloudwalks.com/blog/quickbooks-errors-solutions-how-to-fix-reconciliation-discrepancies