But, it seems that this is a two step upgrade process. The first one is the:
"Firmware over-the-air (FOTA) client update & YouTube player Update."
After you install this upgrade, you will finally be able to upgrade to Android 2.1 when the FOTA client is upgraded.
"Android 2.1 Platform Upgrade "
You can find information about this update on HTC india's website. Here is the link.