I have b2evolution 2.4.2 and have dowloaded the modified files to update to b2evolution 2.4.5......
Quick upgrade paches

If you are already running a 2.4.x release, no database upgrade is necessary and you can upgrade just by replacing a few files. Just make sure you properly update your /conf files.

Can you tell me what i must do to update my /conf files ? how do i do this ?