For details, see the Installing vSphere Web Client Plug-in section in the Veeam Backup Enterprise Manager Guide.
Once the Assign License window opens you will see two options. Click on Edit in the top right of the Licensed Features page. In case of vCenter Server Appliance, open an SSH session to vCenter Server Appliance and remove all entries that are returned by the find / -name '*veeam*' command. Then open the Licensed Features option in the configuration tab of the ESXi host through the vSphere Client.Ensure no plug-in components remain on the vCenter server:.In case of the plug-in with the flex/flash user interface (for VMware vSphere 6.5 or earlier), restart the vCenter Web Client Service ( vsphere-client for vCenter Server Appliance implementation or vspherewebclientsvc for vCenter Server on Microsoft Windows Server).
Select the vCenter server you need and click Check version. XML file (license key) is available for download through the Dell Digital Locker at Dell Digital Locker.In Veeam Backup Enterprise Manager, go to the vCenter Servers section of the Configuration view.Find a Veeam Accredited Service Partner VMware vSphere 7.
Alliance Partner Integrations & Qualifications.Veeam Backup & Replication Community Edition.