You don't need to keep your fingers crossed in the future - everything will work right.

Menu Help/About to see what you have. If it doesn't say SR something (I think), then you have the original.

As for updates, they are all on this page:

http://my.smithmicro.com/win/poser/updates.html

Scroll down to find Poser 6 SR3.

If you're on a Mac, there's a different page.

http://my.smithmicro.com/mac/poser/updates.html

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)