User Approved Kernel Extension Loading. To improve security on the Mac, kernel extensions installed with or after the installation of macOS High Sierra require user consent in order to load. This is known as User Approved Kernel Extension Loading. Any user can approve a kernel extension, even if they don’t have administrator privileges. Download BlueStacks App Player 4.270.1 for Mac from FileHorse. 100% Safe and Secure ✔ Install and run Android Mobile Apps on a Mac OS X. Bluestacks App Player for Mac OS make it possible to use your best Android apps on your Mac.
Try restarting the computer. Then try launching the app. After launching the app, check System Preferences Security tab again. I had a similar issue installing some Intel software which required a driver/extension. After the reboot the software just worked.
If you are running macOS 10.15 Catalina, then maybe the software isn't compatible or some new Catalina security feature is blocking it. I haven't used Catalina yet, so I cannot advise you further on it.
Bluestacks System Extension Blocked Mac
You may need to contact the publisher or developer of the software for assistance.
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