If you have followed the instructions for Kappris Installation here but the installation fails due to a certification problem then you may need to install the certificates manually.
Usually all that is needed is to run the command below from Admin Command Prompt
Certutil –addstore TrustedPublisher Kutana.cer Kutana.cer
It must be installed in this way to register properly.
You can check registration by typing certmgr.msc at a RUN command.
Expand Trusted Publishers as below
Double-click the Kutana Ltd certificate and click the tab as below:
Check that the COMODO certificates are in place as in fig1 and fig2 below:
If they are not correct then install the 4 x .crt files in the COMODO.zip
To install just r-click and choose install certificate on each one. In each case, choose ‘Local User’ and ‘Automatically select certificate store’
The certificates are listed below: