Hi,
I understand that you want to delete the InfoPath template (.xsn file) and delete its catch, so that you can disable users from editing it.
You can find the catch file in C:\Users\<Username>\AppData\Local\Microsoft\InfoPath\FormCache3,
there are probably many folders in that path. To locate the one storing your certain template, you can open every folder and check the .xml file. After find that, you can go back and delete the folder.
If I have any misunderstandings, please feel free to let me know.
Thanks,
Kenon Yin