It worked after i found this:
[2c] Studio One 4 : Software Install Studio One 4 (PC)
*** IMPORTANT NOTE:
Please note the difference between downloading and installing a Studio One versions build and activating Studio One to unlock the core content that is included in a versions installed build. When you download and install Studio One from any source, you are installing the build of that version; 4.0, 4.0.1, 4.1.0, 4.2.3, 4.3.2, etc... In order to unlock the core content for your registered version; Demo, Artist, Professional, you must activate the installed build using the 28 digit product code or the offline 16 digit product key depending on your type of activation. The process of activation will then release the content for the registered version within Studio One once properly activated.