Good Evening, @mf10.
I hope your holiday is going well so far. To get the validation code for your QuickBooks for Mac 2015, we'll have to collect sensitive data to pull up your account. With that being said, I recommend contacting our Customer Support Team. They have additional tools to help you receive a validation code. Here's how to get in touch with them:
- Click the Help menu.
- Select QuickBooks Desktop Help.
- Press Contact Us.
- Type in your question and hit Continue.
- Scroll down and choose to Get a Callback.
Once you're in touch with them, you can also get some more information about going from QuickBooks for Mac 2015 to 2020. However, here's an extra article that can give some insight into what's new in 2020:
If there's anything else you need help with, feel free to ask. I want to make sure that all of your concerns are addressed. Have a great rest of your holiday!