Thanks for reaching out to us, @Jen06. Allow me to share details about the QuickBooks Desktop (QBDT) discontinuation in the United Kingdom.

It's our priority to help you stay compliant. However, we have decided to discontinue all QBDT services for our UK users starting on June 30, 2023, due to the recent changes to accounting and tax regulations. It involves all versions of QBDT Pro, Premier, and Enterprise.

Yes, you're right. The versions available on our Downloads & Updates page are from 2016 until the latest. Those from 2015 and earlier are unavailable for download since we're unable to guarantee older software will operate on newer systems. 

For now, you may want to reach out to retailers outside QuickBooks to search for available QBDT Pro 2015 downloads.

For more in-depth information about the discontinuation, please refer to this article: QuickBooks Desktop discontinuation support.

Additionally, you may want to transfer information to and from QBDT. Doing so makes it easy whenever you need to create a new company file, upgrade, or convert files.

Please don't hesitate to reach out to us if you have additional questions regarding the discontinuation. We're always around to explain further. Stay safe.