How To Solve License Issue In VisionPro 9.1 After Uninstalling VisionPro 9.2

Issue:

The license was working in VisionPro 9.2, but after downgrading to VisionPro 9.1 the license is not recognized, although Cognex Security Service is running. The Cogtool printout gives a message that "No compatible services detected":

Causes:

The Cognex Security Service might be left over from the previous VisionPro installation and might not be compatible with the VisionPro 9.1 version.
To check this, navigate to the folder C:\Windows\SysWOW64\ and find the below files there:

Right-click on cogss_srv, select Properties, then click on the Details tab. If you see a File version other than 2.4.0.0, then the issue is related to the incompatible Cognex Security Service version.

Resolution:

1. Uninstall Cognex VisionPro
2. Open Command Prompt as an administrator, navigate to the C:\Windows\SysWOW64\ folder and execute the below:
   cogss_srv -remove

3. Open File Explorer and navigate to the C:\Windows\SysWOW64\ folder and delete the below files from there:
   - cogss_install.exe
   - cogss_msg.dll
   - cogss_srv.exe

   

4. Uninstall Cognex x64 Drivers
5. Reboot the computer
6. Install Cognex VisionPro 9.1