Thank you for the update, @MadMedic. 

It is vital to keep your company data file's integrity, and the best way to handle this is by updating it using a compatible QuickBooks Desktop trial version. As Fiat mentioned, you don't need a third-party app to do this. The third-party app said in the earlier thread was for importing invoices.

Since we no longer support the QBDT 2008 version, I'd like to ask what version of QuickBooks Desktop you are using on your Windows. This is to determine the correct steps to proceed with this. 

In the meantime, let me route you to our support team to get a copy of the earlier trial versions of the application and to help you in the process of updating your file: Contact QuickBooks Desktop support.

Visit this article for detailed information about the system requirements when installing the trial version of QBDT: System requirements for QuickBooks Desktop 2023.

Let us know if you still have further updates and follow-up questions. Take care.