QB Issue Resolution:

If you have an older release of 2015 you can remove the password from the user name list (company menu) once you use it to open the file.  You can try it in any release. You may get a warning that you should have a password or a message that you must. If the message says you have to have a password then you have an updated release.

Sometimes there are bugs associated with this release, such as the inability to enter a new password. One way to get around these bugs for now is to install an older release.  If you want to do that, see BRC – QB Installation Troubleshooting and Fixes

Resolution for Issue 'How can I disable my password to access my Quickbooks Premier Contractor 2015?' available: Yes (Solved).
Source: Intuit Community forum.

How can I disable my password to access my Quickbooks Premier Contractor 2015?: 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.

Support for Contractor 2015
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Error Recovery for Contractor 2015 [Canada]
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