Update your compliance module to the latest version (e.g., version 4.3.x or higher).
Go to Statistics > General > Web Browser and select Clear Data . 2. Update the ISE Compliance Module (For Admins)
If missing, look for a backup in C:\Windows\System32\DriverStore\FileRepository\ (inside the acnamfd.inf folder) and copy it to the System32 directory. 4. Clean Reinstall and File Cleanup
Reinstall using the latest package from the Cisco Software Download portal. 5. Verify Certificate Validity
If your organization uses ISE, an outdated compliance module or a missing policy for your specific architecture (e.g., trying to push an x64 package to an ARM64 device) will trigger this error.
Missing or misplaced DLL files, such as acnamfdbctl.dll , can prevent the downloader from initializing. Step-by-Step Troubleshooting Solutions 1. Clear the AnyConnect Browser Cache Temporary files can often stall the downloader's progress.