No manuals in helptab?

When I go on the help tab and try to view the manuals it just say Could not find the manual.

Anyone with the same issue?I did a dowmnload upgrade from Cubase 7 to 7.5

sounds like you PDF reader has been corrupted , go to programs> steinberg . documentation and see if they are there

Reinstalled Adobe reader and it worked.
Thanx for the help!