Upgrading SQL Server 2008 Standard to Enterprise I'm trying to do the upgrade but when it asks me for the Product Key for the current version, I can't find it. When I go on the MSDN website for it, it says that a key is not necessary for this product. So I'm at a standstill. Do I need to do the upgrade directly from the Enterprise ISO instead of from the Standard SQL Server Installation Center Maintenance Edition Upgrade option? How else can I get the product key?

Or when it asks from what version I'm upgrading, can I select Express or Evaluation where it doesn't require me to put in the current product key?  Will that affect the upgrade?

Will I definitely need the ISO?  The same deal with that is that it says the product key is not necessary on the MSDN website since we have an EA.
Have your client with the ISOs or install files open the DefaultSetup file within either the x64 or x86 directory, cut and paste, and send you the text for the SQL Server edition you require. It should look something like:

;SQLSERVER2008 Configuration File
[SQLSERVER2008]
PID="AAAAA-BBBBB-CCCCC-DDDDD-EEEEE"


No need to copy/download the whole ISO.