Strange, so the Registry script was applied without error? Then, is this error with unisntalling the same as before? To be honest, the uninstaller won't work because the Registry entries for it have been removed, although they had most likely been broken anyway because of the crack.
I tell you what, I have a better idea. Bear with me whilst I do something. In the meantime, please download
[Total Uninstall] I will install IDM using this program so then it will tell me exactly what was installed. I will then transfer the configuration file for this to you, so you can then use it to hopefully uninstall all elements of IDM.
Although, if you have already removed all known files, it would then be worth trying to reinstall it anyway.