The PolarViewer application has been completely integrated into SportsTracker, it's not a separate application anymore.
The reason was that the usage of these applications is very related, most users need to install both of these tools. So the installation and the usage is now much more comfortable.
Another problem was that Windows users were not able to start PolarViewer from SportsTracker, this works perfectly now.
The new SportsTracker 2.0.0 will be released soon.