Dear,
We answered your question honestly. There is no need to be evasive.
First,please make sure that you mean the update checker you installed from apphit.com?
If you are sure about it and following is the instruction.
It is a small program and it only read your registry. So just find it in your folder and delete it. That's all. You don't need to uninstall it with complex process. Please just have a try!
If there is any further questions, please contact us! Thanks!