Thanks for getting back with the Community, RLBeckham.

QuickBooks for Mac 2021 has a minimum system requirement of Mac OS X v10.15, also known as Catalina. As long as you have that version or a newer one, like Mac OS Ventura, you'll be able to install and use it.

You'll also want to confirm your computer meets the program's other minimum system requirements:

• 250 MB of available storage.
• Product registration required.
• Intel processor, Core 2 Duo or higher.
• 2 GB RAM (4 GB RAM recommended).
• Use Intuit Checks if you plan to print checks.
• CD/DVD drive or internet connection to download the product.
• Multi-user Server: Intel Core 2 Duo or higher processor to run a server.
• Macintosh-compatible printer if you plan to print invoices, checks, deposit slips, lists, purchase orders, mailing labels, reports, or graphs.

I've also included a detailed resource about system requirements which may come in handy moving forward: System requirements

If there's any additional questions, I'm just a post away. Have an awesome day!