1) If you want to use the automatic browser language detection present in
JMS, you need the medium edition.
The basic edition does NOT contain any geo-localisation or browser detection
such as the browser accepted languages.
The joomla language filter is used to redirect the users into a subdirection
ie. domain.com/en, domain.com/fr, ... depending on the browser accepted
language.
The JMS browser feature detection present in the "medium edition" allows
starting the appropriate joomla wesbite based on the browser accepted
language.
Therefore you can have a specific websites for each language or share the
whole content of a same website but change the default joomla language at
startup.
2) As you can read in our FAQ, we do not provide trial version.
If you want to verify that you environment can use the Symbolic Link, see the tutorial video 7 that provide a "hello word" application to verify that JMS can use the symbolic link. Here it is the link to download the "hello word" zip
www.jms2win.com/en/tutorial/75