Since you have a valid Pro key, any legitimate version of BearShare 4.7 and up will unlock the Pro
features for you whether it's old or not. That's not a problem at all. You might as well use the
b25 version because you can control when it goes into ultrapeer mode.

Next time you install any version of BearShare you will see that it really is the version you
installed and it went into Pro mode automatically.