When you buy an upgrade version, you must already have the previous version
If you do not have the previous version already on your computer when you install the upgrade, you will be shown an option to select your qualifying product in an option window, and then enter your previous version serial number
Hi John thanks for your reply But I have CS5.5 Master collection already but in thje Qualifying product it only shows Mater collection 5 and not Master collection 5.5
The CS6 suite upgrades cost different amounts for different levels of upgrades.
For example, to upgrade a suite from CS5 to CS6 would cost more than to upgrade from CS5.5 to CS6... So each upgrade configuration was specific to the versions involved.
You might try anyway with your CS5.5 license and see if that works. But it sounds like you may have gotten duped, because not only is it a bad idea to try to buy Adobe software from eBay, but you should also know that upgrades to CS6 were never sold via any channel other than direct from Adobe: