Arbitrary rejection of license code

[user17579492704]

I successfully installed and updated and used TT Premier 2024 numerous time since earlier this year, now it no longer let me resume using it, giving:
The license code you entered is not valid. Error code: 605.

Since my license code was deemed valid many times during installation, use, and updating, why would it suddenly be deemed invalid when I want to complete my 2024 return?

[Andrew_W]

The TurboTax user license allows one user to install copies of TurboTax on up to five computers that the user owns. When you initially install the software, the product code is tied to your TurboTax account. The same account must be used for each install.

If you have not exceeded the 5 installs, and have verified the product key and account being used are correct, your next best step is to contact TurboTax Support for further troubleshooting: How do I contact TurboTax?