To help fix this, you can copy your QBDT for Mac 2016 company file and save it on your Mac desktop Documents folder. Since you've already contacted our QBDT for Mac Support Team, I'm here to ensure you're able to update your company file from 2016 to 2019 version. Thank you for adding a thread and providing detailed information with converting your QuickBooks Desktop (QBDT) for Mac 2016 to 2019 version. Stay in touch with me if you have more questions while trying to register QuickBooks for Mac 2019. We'd be glad to help as much as we can. If asked, choose your QuickBooks Product.Click on the Get Phone Number button to see the support number.If you continue having the same problem, it would be best to get in touch with our Care Support Team so they can take a closer look at the issue and identify what's causing this error. Once done, we can start running verify and rebuild on your QuickBooks Desktop. Let's secure a backup of your company file before performing the troubleshooting steps. This will help us identify the common data issues within your company file. Let's get rid of the Error 404 when trying to register QuickBooks for Mac 2019 by running the Verifying and Rebuild tool in QuickBooks Desktop. I can help you get past the Error 404 so you can successfully register your QuickBooks for Mac 2019 Thanks for reaching us out today, mathum.
