Here are the upgrade guides for SnapCenter
Upgrade Snapcenter Server
https://docs.netapp.com/us-en/snapcenter/upgrade/task_upgrade_snapcenter.html
Upgrade your Plug-in Packages
https://docs.netapp.com/us-en/snapcenter/upgrade/task_upgrade_your_plug_in_packages.html
Upgrade SCV Plug-in
Upgrade from an earlier release of SnapCenter Plug-in for VMware vSphere
https://docs.netapp.com/us-en/sc-plugin-vmware-vsphere/scpivs44_upgrade.html
Also please go through release notes and also any newer versions available