The service releases weren't only available through Smith Micro. Until recently, Structure had the installers and service releases for previous versions of Poser available on Dropbox. Windows and Mac. But they've been removed.

If someone has the service release (I believe the last for Poser 2014 was 5.2), I think it would be okay to share it, since you can't use it without a serial.

However, I suspect the reason it's been removed is that it no longer works, due to the Flash issue.