Unfortunately, there is no longer a pdf handbook, even for English. Everything is now online in the Adobe HelpX system. Also, unfortunately, that system is not kept up to date. At the bottom of every Adobe webpage, there is usually a link to change the language of the website (if you are not already redirected there by your browser).
Hopefully, this link will take you to the Dutch online user manual.
. . . You can also get to each program's User Guide by pressing the F1 key while in either the Organizer or the Photoshop Editor. If you have installed the program for use in Dutch, you should be taken to the page for your chosen language.