Cil pointed me towards your plugin when I asked a question in one of the RBR forums about maually generating an elevation profile.
I downloaded the plugin this afternoon, but when I got to the activation screen and tried to click "Try Out", a dialog box came up saying the trial period had expired - I haven't been able to use it at all.
yes, some users have experienced similar issues. Unfortunately I still don't have a clue what's the reason for this. The only advice I can offer for now: please try on a different PC if possible. The odds are 99% that this will allow you to try out.