It's so little time to download and install, why would you automate the process? You'd have to be at your computer within that 24 hour period to activate anyway. All the programs offered are still available for download. You can download them anytime. Just go back through the pages of past downloads. It's the free activation of those trial/demo versions that counts. Each activation is different... or somewhat different. I don't believe you could automate the activation part of the installation.
And seeing you'd have to be at your computer to activate anyway... what's another minute or two to download the program too? Even if connection speed was an issue... say you were using dial-up and thought it would take a while to download the program... you'd have to be at the computer initially to get connected... what's a few more seconds to start the download yourself?