One possible reason that it did not proceed with the installation on your iPad is because you've download the Mac installer which is not compatible on your iPad.
To be able to activate the Maximum Security on your iPad, you will need to download the Trend Micro Mobile Security app from the Apple AppStore. You may please click the link below for the detailed instructions:
Should you receive an error saying "This app is no longer compatible on your device." error message upon downloading the app, we apologize but that means that the device you have does not support the latest Trend Micro Mobile Security app version.
We hope this helps. Please let us know should you encounter any issues.