Remove all flavours of Acrobat & reinstall. Running the Reader & Distiller is not recommended.
Thank you Jeff for your answer, I reinstall Acrobat in simplified mode but it's always the same ...
I guess there is some issue with the installation, as you already re-installed the Acrobat and Robohelp for word and problem still persist. For testing, please launch Robohelp HTML and create a blank project and see if you can see the PDF generation option grayed out or highted, if not then you need to completely uninstall Robohelp 9 and reinstall it once again and need to make sure that Acrobat Add should be checked.
Please let me know if that helps.
thank you for your help.
I Launch Robohelp HTML and after create a blank project, option PDF is enabled and I can generate PDF without any problem !
And Acrobat Add is checked when I install robohelp for word ...
I work on an other PC where the button generate is enabled, but i would like to work with mine ...