You may need to disable the spellcheck features in ClaroRead, for example if you are using it for exams. You can disable it in Settings, or install ClaroRead SE instead (it has no spellcheck: contact Support to get a copy if you have ClaroRead Plus). But you might want to disable it and prevent the user from being able to turn it back on.
You have two options: first, you can run a simple program that locks spellcheck off and password-protects it. You don’t need to be an admin, but this only turns it off for the current user. Second, you can set a per-machine registry key that disables spellcheck for any ClaroRead running on that machine. This is suitable for network administrators who want to disable ClaroRead using something like Group Policy.