Troubleshoot download and install issues in Malwarebytes for Windows – Malwarebytes Help Center

Review the items below to ensure a successful installation of the Malwarebytes app on Windows devices. For device requirements, see System Requirements for Malwarebytes for Windows and Mac.

Before installing Malwarebytes on your Windows device:

Verify the device has an active internet connection.
Verify the following rule is added to the Firewall: ark.mwbsys.com on port 443.
Temporarily disable the following:
- Third-party antivirus software
- VPN or proxy settings
If you are running Windows 10 or Windows 11 in S mode, you must disable S mode. S mode only allows the installation of apps downloaded from the Microsoft Store.
- To verify the Windows version you are running, see Which version of Windows operating system am I running?
- To disable S mode, see Windows 10 and Windows 11 in S mode FAQ.
For Windows 8.1 devices and below, you must upgrade to a later Windows version before downloading the app.

Run the installer locally on your device and not from a network drive.
Reboot the system immediately when the installer requests a restart. The installer should launch automatically. Do not start the app manually.
If you are upgrading, install to the same location as the previous version. Most users install in the default location, C:\Program Files\Malwarebytes.
To install in a different location, you must first uninstall the app from the device.
On Windows 10 and Windows 11, if you see a message window with The app you're trying to install isn't a Microsoft-verified app, update your app installation settings.
- Click Change my app recommendation settings on the message window to go to the Apps & Features menu. Under Choose where to get apps, select Anywhere.