Good evening, @mahermahmood. 

Thanks for following the thread and sharing your concerns. 

In order to purchase QuickBooks Desktop for Mac 2020, you'll need to contact our Mac Support Team. From there, one of our dedicated agents will go over pricing details with you. Once you've purchased a license, you can use the steps that my colleagues have provided above to install and register the product. 

Here's how to connect with an agent:

1. Go to this link: https://quickbooks.intuit.com/learn-support/en-us/configure-products/contact-the-quickbooks-desktop-....
2. Choose QuickBooks Desktop for Mac chat.
3. Complete the needed information, then submit the request. 

Please know that you can reach back out here if you have any questions or concerns. Take care!