Hi W. Andreas,
You can download the Source Code Add-on setup from the following link.
https://www.syncfusion.com/support/directtrac/downloads/13_3_0_7 Q1) release dates for the offline documentation PDF user guide
A1) We’ll provide the PDF user guide on 9th October, 2015.
Q2) class reference for the visual studio 2015 help viewer 2.2 format
A2) Syncfusion Offline Class reference supports Visual Studio 2015 Help viewer 2.2 format.
Regards,
Manivannan S.