Hi Trinitro,
Thank you for contacting Syncfusion support.
Below are the few suggestions that would be helpful for you to resolve the outdated Android SDK build issue.
1. If you have installed Android SDK Build-tools version 24 manually using the SDK manager please refer this
Link for resolving the issue.
2. You can also try to uninstall the Android SDK tools 24.0 or above and update as below line, in the <PropertyGroup> element in Invoice.Android project Invoice.Android.csproj file.
“<AndroidSdkBuildToolsVersion>23.0.3</AndroidSdkBuildToolsVersion>”
Regards,
Kesavan