When you upgrade your edition (for example, Advanced to Enterprise, or Enterprise to Platinum) you receive new Citrix product licenses that you can allocate to one or many Citrix License Servers through license files created at citrix.com. Rescinded licenses must be removed from license servers within ninety (90) days of new license purchase. Removing the licenses enables:
Never delete the options file (citrix.opt) or startup license (citrix_startup.lic).
If you added license files with the console, you must update the console UI after removing those files.