Sometime when you are using the cracked IDM you will continuously receive a message that
IDM have been registered with fake serial number . Be aware that the cracked product may work incorrectly and download files with errors. thus we advice you to purchase the full featured product.
and you will get this message until you exit IDM.
The Solution to the is given below :
First Close the IDM.
Go to run > type regedit > Ok
Registry editor will be opened.