What update required for Windows 2008 R2 RDS cals licensing using windows 2012 RDS cals

Hi

We have windows 2008 R2 RDS server, we have purchase Windows 2012 RDS User cals which says it can be use for Windows 2008 r2 as well,

When I enter the license key to license to add new cals its says "Invalid or missing Data" ,

The vendor says you need to update with latest SP2  but their isn't any SP2 for windows server 2008 R2

do anyone know  which KB? i have to update for this?
tran_2012Asked:
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Cliff GaliherCommented:
2012 RDS CALs need a 2012 licensing server. If you only have 2008 R2 then you'll need to exercise downgrade rights to get 2008 R2 keys. How you do that depends on how CALs were purchased. VL is by far the easiest as downgrade kets are made available in VLSC automatically.
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