Hello Mehmet,
There is an Info link next to the EBF title: it should contain the info you are lookign for.
For example, browse for PowerDesigner support packages and patches, select a verison and scroll down. You should find for 32-bit platforms:
POWDES165004P_1-10013311.ZIP EBF 23575: 16.5 SP04 PL01 PowerDesigner (32b)
Next to Patch Level 1, click the Info link. It opens a new window, click the note 2074301 to open the release notes. There are many attachments including the buglist.
HTH,
Arnaud