I understand that this situation has been challenging for you, @amg_buyer. I'm here to lend a hand on how you can open your company file. 

QuickBooks Desktop for Mac 2019 is no longer supported, as it has been discontinued. As a workaround, you can restore a previous backup of your company file. 

However, if this doesn't work, I recommend contacting the support team for further assistance and to explore other options.

Here’s how:

1. Open QuickBooks.
2. Go to Help, then select QuickBooks Desktop Help/Contact Us.
3. Select Contact Us.
4. Give a brief description of your issue, then select Continue.
5. Sign in to your Intuit account and select Continue and then Continue with my account.
   • If you don't already have an account, make sure to Create a new account.
6. We'll email you a single use code. Enter your code and select Continue.
   • If you have more than one account, select the account you want to use and then Continue.
7. Choose to chat with us or Have us call you.

To know their availability, please check our support hours.

More details about the discontinuation can be found here: QuickBooks Desktop service discontinuation policy and upgrade information.
 

Also, you can read through the subjects in our QuickBooks for Mac user's guide to learn how to manage your bank transactions and other finances with QuickBooks Desktop for Mac.

Please keep us posted if you need help managing your data in QuickBooks Online. We want to make sure the process is seamless.