It is Acrobat Pro 9. There was no problem with autoupdating of all Adobe CS4 programs (including Acrobat) on XP computer. When CS4 was installed on a new Windows 7 computer, autoupdating was disabled (probably due to the incompabitilty with Win7 system). That's why I tried to manually update Acrobat by downloading update patches from Acrobat dowload site. They came in MSP format. Yesterday, I posted a question about how to update MSP file to the Adobe Acrobat forum. There was not a single response.