These are maintenance releases with bug fixes and performance improvements. A listing of the issues fixes is included in the update distribution archives.
Note that the links above lead to a page where you can download the appropriate update distribution. These downloads are for updating existing installations only (i.e. they can't be used for a clean installation of the product).
The entire Polarion Software team would like to thank you for using Polarion solutions, and wish you a pleasant winter holiday season and a prosperous new year.