CB Defense: Error: "ctiuser.dll is missing from your computer" After Sensor Downgrade
CB Defense Sensor: 3.4 and Below
Microsoft Windows: All Supported Versions
Sensor Version Downgraded
Ctiuser.dll missing from c:\windows\system32
All Apps experience error: "Application popup: <Appname>.exe - System Error : The program can't start because C:\Windows\system32\ctiuser.dll is missing from your computer. Try reinstalling the program to fix this problem. "
Downgrading is not currently supported
Downgrade causes the sensor to be a nonfunctional state
Put the sensor into bypass mode
Reinstall Sensor on effected endpoint
DSEN-5163 was applied in sensor version 3.5 to prevent downgrades.