Hello Ruben
If you want to set the JAVA_HOME system wide then /etc/profile instead if you want to set for a specific user then set it in the $HOME/.profile of that particular user.
Previously I suggested you to set the JAVA_HOME to /usr/java/jre1.7.0_66 instead of /usr/java/jre1.7.0_66/bin
Regarding the User Interface mode try setting the DISPLAY variable as well.
You can run /soft/SAP_Download_Manager_1.0_Installation_/Linux/NoVM/install.bin -help to get the list of options and if possible try the silent mode after fixing the JAVA_HOME variable
Regards
RB