I appreciate you joining us here in the thread, @Alp2.  I'll be glad to share some insights about validation code for your QuickBooks product.

To get a validation code to activate your license, you'll need to reach out to our Custom Care Team. Our dedicated tech support agents can review your account in a secure environment and provide an activation code.

Feel free to refer to this link to have a representative review your account: Contact QuickBooks Desktop support.

Once you have your validation code, you can proceed to activate the program. Refer to this article for further guidelines: Activate QuickBooks Desktop for Windows.

Know that you can always get back to me if you need further assistance activating your QuickBooks Desktop. You can also post here in the Community space if you need help performing specific tasks in QuickBooks. Our team of product experts is always around to help you. Take care, and have a great weekend!