If you previously bought the Pro key but it isn't showing up as "Active":
Ensure you are logged into the same Play Store account used for the original purchase. Secure settings pro license key
You would download the main Secure Settings app and then purchase the "Secure Settings Pro" key from the Play Store. Once installed, the main app detects the key and removes all limitations. If you previously bought the Pro key but
: Dynamic changing of the system font size, which is useful for specialized automation profiles (e.g., "Car Mode"). Additional Capabilities : Dynamic changing of the system font size,
The safest method. When you buy "Secure Settings Pro" as an in-app purchase or standalone app on Google Play, Google assigns a license to your Google account. No manual key entry is required—the app authenticates via the Play Store.
Make sure both the main app and the Pro Key app are "Not Optimized" in your battery settings, or the main app might fail to "see" the license.