Here is post I wrote that has the links to retrieve already purchased software and the license numbers (US):

https://www.artesanibookkeeping.com/desktop-quickbooks-links-downloading/

Resolution for 'already purchased software issue: 'Product and Licence number for QB 2016?' available: Yes.

The already purchased software 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 already purchased software issue yourself by looking for a resolution described in the article. If it is a complex already purchased software issue or you are unable to solve the issue, you may contact us by clicking here or by using other already purchased software support options.

For more information about resolving issues related to already purchased software in Quickbooks/QBO or to get support for the issue 'Product and Licence number for QB 2016?', click the link below: