I bought i ssl certificate when i want install it i get this :
Certificate verification failed!The system did not find the Certificate Authority Bundle that matches this certificate.Contact “DigiCert Inc” to obtain the Certificate Authority Bundle for “GeoTrust RSA CA 2018”.
Based on the error message, you don't seem to be using a GoDaddy Certificate. My best guess would be that an intermediate certificate or a certificate bundle was not installed with the SSL.
You may want to contact your certificate provider for more details, and if you continue to have trouble reply with what service you are trying to install the SSL on, and perhaps a Community member will be able to provide further suggestions.