In QB click on Help > About QB. You should see a green product window. Press CTRL+R+P and enter your validation code. If you don’t have one, call 800-316-1068.
Resolution for '2011 issue: 'Cant register Quickbooks Pro 2011 after reinstallation.' available: Yes.
The 2011 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 2011 issue yourself by looking for a resolution described in the article. If it is a complex 2011 issue or you are unable to solve the issue, you may contact us by clicking here or by using other 2011 support options.
For more information about resolving issues related to 2011 in Quickbooks/QBO or to get support for the issue 'Cant register Quickbooks Pro 2011 after reinstallation.', click the link below: