Quickbooks could not verify the digital signature for the update file

Quickbooks always verifies the digital signature for the files which are downloaded and this is done by a program of Quickbooks. When such error occurs that Quickbooks is not able to verify the signature there are various steps that could be taken to fix this like refreshing or resetting the browsers.

Steps to resolve Digital Signature for Updated file

There are steps to configure the system through which this kind of update error can be stopped. You can always update the services and check if this is happening in particular file type or file. Quickbooks may be showing this type of verification issue because of data repetition this can be resolved by restarting the Quickbooks and then trying the same.
When the updates for Quickbooks are downloading at that point of time such issues are seen to happen so while any updates or process is downloading in Quickbooks or updating any file. To avoid such errors Quickbooks should not be running different process but should be working on digital signatures without any disturbance.

Further Reading