I use internet downloader, the trial version and after the 30 days I entered a key but they said the key is wrong and whenever I try installing new one, it displays a fake key has been entered and thus prevent me from using it. Can someone help me completely uninstall so that I can use it again.
Keys are specific to the software that is installed, there is only one key that will fit your IDM and to get that key you must purchase a licence. The good key will then be e-mailed to you or will appear on the web page from which you paid for it.
Trying any other keys, thousands of them to find the one that will fit may take you to December 2099 if not more.
They made it that way to protect their copyright. Can you blame them ?
I forgot to mention that the trial version of IDM is now inscribed in the "Legacy" section of your registry saying that you tried it and all the legacy entries cannot be deleted. So if you try a new trial it will again ask you for a key.