Download
The JLanguageLearn installer can always be downloaded at
http://www.jlanguagelearn.com/downloads/JLanguageLearn_Installer.jar
After you downloaded the installer you either have to double click the file or open a shell and enter
java -jar JLanguageLearn_Installer.jar
such that the installer starts.
Be sure to have valid Java installation on your machine. The minimum version is Java 1.5
The server addresses of the lessons are:
Spanish for Germans -> http://www.jlanguagelearn.com/jllunits German for anglophones -> http://www.jlanguagelearn.com/german
You have to enter this address again if you deleted it from JLanguageLearn Manager.