These links may be sort of difficult to find on the Jdownloader site, but here they are.
32bit version:
http://installer.jdownloader.org/ic/JD2 ... up_x86.exe
64bit version:
http://installer.jdownloader.org/ic/JD2 ... up_x64.exe
Source:
https://jdrch.wordpress.com/2013/10/01/ ... installer/