I appreciate the information you've shared regarding your concern, @gardensbyellen.
When using QuickBooks 2020 with an upgraded macOS Sonoma, you won't experience any loss of functionality. However, you may encounter compatibility issues.
If you want to keep using QuickBooks 2020, you'll need to downgrade your operating system to ensure it works properly with your QuickBooks version. You can reach out to Mac Support for guidance if you need help with the process.
- Go to Help, then select QuickBooks Help.
- Click Contact Us.
- Give a brief description of your issue, then click Continue.
- Select to chat with us or Have us call you.
On the other hand, if you'd like to stay with your current operating system, you may consider upgrading your version to QuickBooks Mac 2024, as this seamlessly runs the Mac OS Sonoma without any issues or complications.
To learn more about how you can benefit from the latest Mac version, explore this article for more details: What's new in QuickBooks Mac Plus 2024.
I'll be around if you have further questions about compatibility. Take care
