I researched on the internet to purchase an UPGRADE verison from XP Office
Professional to XP Office Developer - but none of the websites have it in
stock.
I thought I purchased it at one site, but a day later I rec'd an email that
they were out of stock. I researched "How to Buy" on Microsoft, but was
unable to locate the upgrade.

Does anyone know where a upgrade version can be acquired?

Or do I have to purchase the full version?

Thank you
MSweetG222