After downloaded a minor release of ISE DS (e.g. 11.3, 12.4, etc...), I wish to download the associated WebPACK license through the Xilinx License Configuration Manager (XLCM) Acquire License window:
Or by simply going to the Xilinx License generation page: http://www.xilinx.com/getlicense
However, the Create License tab does not appear to have a WebPack entitlement available for creating a license:
This is most likely due to having generated the WebPACK license already. Only one WebPACK entitlement is granted for each major release. The version limit for a WebPACK license is set one year from the major version release (e.g. 11.1, 12.1 etc) and subsequent minor releases will be supported since they are released within the time frame of the version limit.
Check the Manage Licenses tab to see if a WebPACK license has been generated. If the version limit is valid for the software version you are using, you can simply download this license again for use.
If the Version limit has past, remove the created WebPACK license from the "Manage License" tab in the License Creation area on Xilinx.com.
Then, if you navigate back to the "Create New License" tab, there should be an entitlement again for WebPACK license.
Create this new WebPACK license and this should work for the current release.
Each year, every Xilinx License account will be updated with a new WebPACK entitlement to allow users to generate a license for current versions.