Hello! I see that you made a payment for a Brushstroke app order but haven't received it yet. Let's get this sorted out together.

First, just to clarify:
- Did you purchase the Brushstroke app through the App Store on your Mac running OS X 10.15.7?
- Have you checked your email (including spam/junk folders) for any order confirmation or download instructions?
- Do you see any charges on your payment method confirming the purchase?

Once I have a bit more detail, I can guide you through the best next steps. Meanwhile, a common approach is to check your purchase history in the App Store to confirm if the purchase went through and the app is available for download. If it shows as purchased but not installed, you can download it again without being charged.

Please let me know what you find, and we'll continue from there!