Thanks to SoS for clarifying the licensing policy with this :
“You must download, install, and run this giveaway before the offer has ended.”
However, I’ll still be a bore for a minute and ask once again : can you do this, then, long after the offer has ended, uninstall (or completely erase your disk while reinstalling Windows from scratch), then reinstall the program ? The way this sentence is written does not exclude this.
Also, if the real meaning is you can’t reinstall the program once the offer has ended, is this a) the case for all SoS offers, b) a change of policy, or just a clarification of an existing policy ?
My understanding is that SoS required you to install the software on offer right away, but that, contrary to some other promotional sites, it allowed later reinstallation.