Cannot install acrobat 9 pro updates on osx lion

Hi,

I have not browsed through the forums here, so please forgive me if this question had been asked before. Are there known issues between Acrobat 9 Pro and OSX Lion? We have a user who has OSX 10.7.5 and Acrobat 9 Pro. He is not able to update Acrobat as there is no option to do so when he clicks on Help. He tried manually downloading and installing updates but when he is asked to select the copy of Adobe product to update, he only has the option to cancel.

I installed Acrobat 9 Pro on a Macbook running Mountain Lion and did not encounter any problem installing updates.

Is this a known issue?

Thanks,

M