I've recently reinstalled Aria Player and GPO4 on a new Hard drive after a serious XP Registry failure. I use GPO4 mainly within Sibelius 6, and very occasionally as a stand-alone.
All seems to work well, except that if I start in stand-alone mode, or if I go to the Aria interface panel from Sibelius, I'm told Aria isn't activated, and the message asks me if I want to download my activation. I already have an activation file, and I assume it is still valid.
If I drag the existing .png authorisation file onto the player, it tells me Garritan ARIA player is now activated for Aria Player, which sounds very encouraging, if somewhat tautologous, but it doesn't stick. The next time I happen to see the player, maybe days or weeks later, it once again tells me it isn't authorised.
What do I do? So far, ARIA has always worked — it's only on those rare occasions that I see it, rather than just let Sibelius do its magic behind the scenes, that the problem occurs.