QB Issue Resolution:

One nice thing I found is that the complex password is reversible. I had a simple accounting file for a trust – but presence of the EIN in company information triggered the complex passwords when I installed the R7 update. I was able to go in and remove the EIN (wasn’t necessary anyway) and delete the password. Now the file opens without any password requirement.
This page has been updated – see Q11:
https://community.intuit.com/articles/1370759-quickbooks-desktop-security-information

Resolution for Issue 'Get rid of the newly required password on Quickbooks Pro 2016, desktop. What a miserable, lousy update. Undo it. Now.' available: Yes (Solved).
Source: Intuit Community forum.

Get rid of the newly required password on Quickbooks Pro 2016, desktop. What a miserable, lousy update. Undo it. Now.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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