Gartner Research VP, Neil McDonald & AlgoSec CTO, Prof. Avishai Wool, discuss the business-driven approach to automated security policy management, its benefits and how to align security policy management with business processes to address today's security challenges.
The same commands will work for a windows server but you need to modify the path to your p12 certificate file, should be something like the following (but please check by doing a search for sic_cert.p12):
cpca_client revoke_cert -n "CN=cp_mgmt"
cpca_client create_cert -n "CN=cp_mgmt" -f C:\Program Files\CheckPoint\CPShared\
cpstop
cpstart
The options in your GUI tool are to do with the VPN cert but I'm assuming the one which is expiring is your internal CA certificate upon which your VPN cert is based. The commands above should renew your current certificate meaning that there will be no disruption to the VPNs.