QB Issue Resolution:

I doubt that you can get an activation code for such an old program, but your only hope is to call Support.

Resolution for Issue 'Activate QuickBooks 2006 without going online' available: Yes (Solved).
Source: Intuit Community forum.

Activate QuickBooks 2006 without going online: 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 Call Support
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Error Recovery for Call Support [Canada]
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Additional Support Options: