It's nice to see you here in the Community, TwispRiverSeed.
It's important to make sure QuickBooks is up to date on the latest release to take advantage of updates and bug fixes. You may want to uninstall and reinstall your QuickBooks.
For detailed steps, check out this recommended article: Update QuickBooks Mac Desktop.
And yes, you'll still be able to access your eight years of data, We can create a backup copy or your company file and restore it your QuickBooks 2016. However, before installing and using QuickBooks Desktop for Mac, it is important to know the necessary system requirements. This will ensure that QuickBooks is compatible with your computer and will help avoid problems when you start using the program.
To create a backup of your company file, here's how:
After that, let's restore the company file:
Once the company file is restored, QuickBooks will ask you to update the file. Just click the Update button.
For detailed information about creating and restoring your company file, see the following resources below:
It'll be always my pleasure to help if you have any other questions. Just keep me posted in the comment section down below.