Fix IDM has been registered with a fake serial number


This article will guide you through fixing IDM has been registered with a fake serial number or the serial number has been blocked error message.

Internet Download Manager (IDM) is a popular download manager for Windows. The only difference between IDM and other popular download managers is that IDM is a paid software which means that you need to buy it to use it.

If you have bought IDM lately, you may lead to a few problems like “IDM has been registered with a fake serial number or the serial number has been blocked“. Or you may have used a trial or cracked version of IDM before but have purchased the new IDM but still you get the same error message when you try to register with your legal serial number.


Here are some solutions which you may try before contacting the IDM support team. By the way, this IDM support page lists down some of the problems and their possible solutions but these are not enough to get you out of this situation. You may also try our solutions first.

Tweaking IDM files

We will need to tweak some program files of IDM in order to stop it from showing the fake serial number error message. Let’s go through the tweaking steps:

Internet Download Manager folder files tweaking

  1. Go to C:\Program Files\Internet Downlaod Manager or C:\Program Files (x86)\Internet Downlaod Manager on a 64-bit computer
  2. Search and delete the file called IDMGrHlp.exe
  3. Now copy idmBroker.exe from the same folder and paste it in the same folder and rename it to IDMGrHlp.exe
  4. Restart the system for the changes to take effect

If you are still having problems and error messages are popping up, you may disable the automatic update function of IDM using the following methods:

Disable automatic updates in IDM

You can disable automatic updates of IDM using Windows Registry

  1. Go to Run –> regedit
  2. Go to HKEY_CURRENT_USER\Software\DownloadManager
  3. In the right hand pane, select CheckUpdtVM and edit its value to 0

Editing Hosts File to block IDM updates

  1. Browse to C:\Windows\System32\drivers\etc\
  2. Open hosts file using a text editor like notepad
  3. Copy and paste these lines at the end of the HOSTS file:

Please note that this will disable the update function of Internet Download Manager. You will need to download the latest updates manually.

If you are still getting errors, the best way is to download Internet Download Manager from Tonec website again, uninstall the previously installed IDM completely and reinstall IDM using the newly downloaded installer. You may also contact their support department which is quite responsive and friendly.

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  1. ive try but stil got a popup message
    “IDM is corrupt the main idm executive file is damaged. it’s possible that it was infected with a virus.”
    “please download the latest version of idm from our web site, and install it over your current version. just run downloaded idm installer, and it will replace the damaged files. do not worry, because all downloads and idm settings will not be infected”

    well ive got a some solution, just set “read only” on host

  2. Thanks, I applied both the first and 2nd options and it worked for me. Though I originally used a crack copy before I now purchased the original copy but still receives the fake key message. Thank you for the post

    • iTechtics Staff on

      Alas you can make use of any free HOSTS file editor or open notepad with administrative privileges and then edit the HOSTS file.

  3. Re: In the right hand pane, select CheckUpdtVM and edit its value to 0

    Found nothing in the registry that bears the name “CheckUpdtVM” or anything even similar to it ?

  4. The Drifter on

    worked like a charm for me but i never had an illegal copy of idm on my machine. i did however have a different license on it at one time before i bought a second. i used the first solution, (Tweaking IDM files) and its been 3 days with no more problems.

  5. Doesn’t work any more. After every restart, IDM modifies the host file on its own and puts a # in front of every entry with “idm” or “internetdownloadmanager” so that your host file ignores the line. Gotta block them through your firewall or URL filter through your router now.

  6. if you have an error message “fake serial number”, just run this in a Command Prompt :

    reg delete “HKEY_CURRENT_USER\Software\Classes\Wow6432Node\CLSID\{6DDF00DB-1234-46EC-8356-27E7B2051192}” /v MData

    Enjoy !

    • JustSomeRandom on

      Newest ver:
      reg delete “HKEY_CURRENT_USER\Software\Classes\WOW6432Node\CLSID\{79873CC5-3951-43ED-BDF9-D8759474B6FD}” /v MData

      Add hosts entries and if local administrator lock down permissions on hosts file, owner = system after setting permissions to only allow read to users/administrators/system and IDM won’t be able to comment out sections. 🙂 enjoy.

      • After every start of IDM, the host file gets modified on its own and a # appears in front of every entry with “idm” or “internetdownloadmanager” so that the host file ignores the line. how to prevent this?

    • iTechtics Staff on

      Hi Gascon, it’s just a typo. It should be two lines instead of one. I have fixed this in the article. Thanks a lot for pointing out.

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