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In order not to lose remaining time for a Certificate that is close to the expiration date, you need to make sure to purchase a renewal certificate and generate a new CSR. We strongly recommend not to use the original CSR code used during initial certificate activation. Please make sure to purchase and activate a renewal certificate and not a new one - this will also help you deal with validation process in case you have an OV/EV certificate.

NOTE: renewal does not happen automatically, you need to generate a 'renewal CSR' code plus a RSA Key, follow up the process similar to activation and then reinstall the Certificate on the server for the renewal to take effect.