Hello Jose!

Hope you must be doing fine!

Here is the way to retrieve the group/user passwords from your VPN Concentrator:
 
1- Go to 'Administration| Access Rights | Access Settings' and make sure you
select "None" under "Config File Encryption".
 
2- Go to 'Administration | File Management | XML Export' and select a name
for the XML file. This will export your running configuration into a XML
file, which can be retrieved in the "File Management" tab.
 
Open the XML file and search for the group name, you will find a field with
the unencrypted password.
 
NOTE: Please don't forget to set back the access setting to its previous
configuration in case you want to set it back to it's original settings:
Go to -- > Administration | Access Rights | Access Settings-- > Config File
Encryption and select RC4 Select configuration file encryption, Apply and
Save

Let me know how it goes.

Thanks 

Ankur