If you read carefull the email I have sent with RC2, it is mention that you can get the latest version at any moment.
The procedure is remember in the email.
You can always check the JMS change history in the FAQ.
See
www.jms2win.com/faq/change-history-v12x
The current latest version is JMS 1.2.0 RC4.
To get the latest version, see the procedure in the FAQ
/faq#sec-122
The sharing operation is something that is decided when you create the DB and that can not be modified later.
If you want to change VM from specifc extension into shared extension you have to un-install VM and re-install it with sharing.
You have to check also with JMS tools that you have correctly converted all the physical tables into links.