Hi there, stacymansur-hotm.
You can utilize a trial license of QuickBooks for Mac 2021 to upgrade your company file. Then, migrate to QuickBooks Online. Please browse this article to learn how to get the installer: Download a trial of QuickBooks Desktop.
Also, since QuickBooks Desktop for Mac 2016 is no longer a supported version of QuickBooks. This affects the compatibility and system requirements with Apple's new macOS 11.
To get this working, you might want to reset the macOS update and then, upgrade your QuickBooks program.
Once reverted, create a backup of your company file to ensure you'll have an original copy that you can restore in case of data loss. When done, head to the Download Center at this link to download the latest version of QuickBooks.
Lastly, here's an article you can open to know more about converting a QuickBooks Mac Desktop file to QuickBooks Online. There's a phone number you can dial in case you need more assistance with the process.
If you have any other questions about opening your QuickBooks Desktop for Mac file, please let me know by commenting below. I'm always here to help. Have a good one!
