When you bought Pro-version you actually bought "BS.Player PRO + 12 months subscription to updates
and upgrades". So within those 12 months no additional (licence)fees are due; not for updates nor for upgrades!
In that connection please log into your
user area (click here).
You can then click on "License information" to see until what date your licence is valid/active. (Your licence-key is also stored there. E.g. if you lost it, you can re-send it to your email address.)
If you click on Download/Upgrade BS.Player, you can always download current/latest or older versions
upto the expiry of your licence. Ever after your licence expired, you can still download all versions which were released upto the expiry-date (which is a good thing e.g. when your PC crashed
*) and you want to re-install your purchased software.)
Also latest Beta version (if any) can be downloaded there.
*):
In this connection it is evident that you need to make sure that you're able to retrieve your username for BS.Player website (your e-mail address) and your password for BS.Player website (so store them in a safe place)!