My company upgraded to SAV 10.1.15 corp ed about 1 year ago but I was not here at that time. Currently we have two licenses/certificates in PDF files that Symantec sent us via email. Each one has its own serial number. One says "SYMC ANTIVIRUS CORP ED WORKSTATIONS & SERVERS 10.2 NODE BNDL VER UG LIC EXPRESS BAND C ESSENTIAL 12MO", the other says "SYMC ANTIVIRUS CORP ED WORKSTATIONS & SERVERS 10.2 NODE I/O ESSENTIAL 12 MONTHS". One of them expires next month. Do I need to renew it so we can contiune to use SAV 10.1.15? We are not planning to upgrade to Endpoint 11.0.