Malwarebytes for Windows provides error codes and messages for installation pre-requisites, installation, connection, activation, and authentication issues. This article describes the error messages including error code, description, and recommended resolution for the error encountered.
Installation Pre-Requisites errors
| Message/description | Resolution |
| The Malwarebytes installer cannot be run from a network drive. | Install Malwarebytes for Windows from the device's local hard drive. |
| Your system does not have enough free disk space to install Malwarebytes. | Free up storage space on your device to install Malwarebytes for Windows. |
| You do not have sufficient permissions (either disk or registry) to install Malwarebytes. | Install Malwarebytes from a user profile with Admin permissions. Contact your system administrator, review Installation troubleshooting for Malwarebytes on Windows devices. |
| To complete the installation of Malwarebytes, your system may need to be restarted. Click Yes to continue anyway and you will be prompted when a restart is needed. Click No to cancel the installation. | Click Yes to continue the installation and restart after it completes. Click No to cancel the installation. Restart your device, then run the installer again. |
| Update Windows to stay protected. A missing Windows security update is required to update Malwarebytes. | Check system requirements, and review Windows 2019-09 Security Update for Windows devices running Malwarebytes home products, then try installing again. |
| Invalid path. | Submit a ticket with Support. |
| The installation failed to start. Please try running the installer again. For help troubleshooting please review the information at https://www.malwarebytes.com/help-installing | Follow installation troubleshooting information, then try installing again. Installation troubleshooting for Malwarebytes on Windows devices. |
| The installation failed. Please restart your system and try running the installer again. For help troubleshooting please review the information at https://www.malwarebytes.com/help-installing | Follow installation troubleshooting information, then try installing again.
Installation troubleshooting for Malwarebytes on Windows devices. |
| Restart required. Malwarebytes must restart your computer to finish the installation. Some functionality may be limited until your computer restarts. | Restart your computer to complete the installation process. |
Installation errors
| Message/description | Resolution |
| Malwarebytes for Windows does not support this system's CPU or hardware architecture. | Your ARM device is not supported. Install Malwarebytes for Windows on another device. |
| This version of Windows is not supported. | The up-to-date version of Malwarebytes can't be installed on this device. Install Malwarebytes for Windows on another device. |
| A corporate Malwarebytes product is already running on this computer. | A business version of Malwarebytes is already installed on your device. Uninstall the business version to install Malwarebytes for Windows. |
| An unsupported legacy version of the product has been detected. Please uninstall and then try again. | Uninstall the legacy version of the product before installing the up-to-date version of Malwarebytes for Windows. |
| This version of Malwarebytes Anti-Ransomware is not compatible with a product that you currently have installed. The existing installation already includes Anti-Ransomware functionality and is incompatible with this version. Contact your System Administrator for assistance. | You are already running a Malwarebytes product that includes anti-ransomware protection. Contact your system administrator. |
| An error has occurred and Malwarebytes will not install on your computer. | Submit a ticket with Support. |
Connection errors including networking and general errors
| Code | Message/description | Resolution |
| MB404104 | Unable to contact license server. Check your network connection or contact your system administrator for help. |
Check you have an active internet connection, and review Installation troubleshooting for Malwarebytes on Windows devices. If the issue persists, submit a ticket with Support. |
| Unable to contact license server. Check your network settings or contact your system administrator for help. | Check you have an active internet connection, and review Installation troubleshooting for Malwarebytes on Windows devices. If the issue persists, submit a ticket with Support. | |
| Unable to contact update server. Check your proxy settings or contact your system administrator for help. | Check you have an active internet connection, and review Installation troubleshooting for Malwarebytes on Windows devices. If the issue persists, submit a ticket with Support. | |
| Unable to contact update server. Please check your internet connection. | Check you have an active internet connection, and review Installation troubleshooting for Malwarebytes on Windows devices. If the issue persists, submit a ticket with Support. |
Activation errors
| Code | Message/description | Resolution |
| MB403100 MB403101 |
There's an issue with your license key. Please contact Support. | Submit a ticket with Support. |
| MB403101 | Installation token not found. | Submit a ticket with Support. |
| MB403102 | Your license key has expired. | Purchase a valid subscription. Visit our Pricing page. |
| MB403102 | This license key does not match our records. Please make sure you entered it correctly. | Check your license details and try again. If the issue persists, submit a ticket with Support. |
| MB403102 | Entitlement not found for this product. | Purchase a valid subscription. Visit our Pricing page. |
| MB403103 | This license key does not match the product you are trying to activate. | Purchase a valid subscription. Visit our Pricing page. |
| MB403104 | Device limit exceeded. You've reached the device limit for your subscription. Purchase another license or add another subscription. | Deactivate devices or purchase another subscription. See how to deactivate a device or visit our Pricing page. |
| MB403105 | This license key has been refunded. | Purchase a valid subscription. Visit our Pricing page. |
| MB404102 | The license key doesn't match our recording or has expired. Please purchase a new subscription and try again. | Purchase a valid subscription. Visit our Pricing page. |
|
MB403101 |
You've hit your device limit. To activate Premium on this computer, log in to your account and deactivate another device or upgrade to a larger subscription. | Deactivate devices or purchase another subscription. See how to deactivate a device or visit our Pricing page. |
| MB404102 | There isn't a subscription registered to your account. You can purchase a Malwarebytes subscription or register a license key to your account. | Purchase a valid subscription, visit our Pricing page, or register a license to your account. |
Authentication errors
| Code | Message/description | Resolution |
| MB405100 | You have reached the maximum amount of sign in attempts. To unlock your account, contact support. | Wait a minimum of 24 hours, then try to sign in again. If the issue persists, submit a ticket with Support. |
| MB405108 | Verify your email and password are correct and try again. | Check your sign in credentials, then try to sign in again. If the issue persists, submit a ticket with Support. |