Hi ahmad1988,
You want to update the plugins (is the CV Toolbox installed?) or the application itself?
The installer for the toolbox is the Toolbox menu above.
The application
Typically you should be able to use the update option inside Cinema 4D: Main Menu> Help> Check for updates.
Or a direct download:
http://www.maxon.net/en-us/support/downloads/
If your problem continues with the application itself, please contact the support.
https://www.maxon.net/en/support-center
Fingers crossed that you are up and running in no time.
Cheers