Automate update of trial downloads for 4.3.x BigMemory releases.

[jhouserizer]

We should have a trial kit (of latest 4.3.x release) that is updated weekly, and which includes a 90-day trial license (perhaps create the license to last 97 days).

Probably this should upload to a consistent file name on S3 which we can then simply link to statically from the softwareag.com website - or else we need to provide some redirect scheme that allows a static link from softwareag.com to get to the file for trial download.