In Signlab, go to Help > about Signlab. When the about Window is showing, type R,it will show you the major version, minor version and build.
This is the latest.
If yours shows an earlier build or minor version you can update online using "Update Signlab" from Start > Programs in windows.
There is a video named Update Signlab Here, should you need help.
For the VPM issue, I would need more information, error messages etc. But if your Signlab is an early build updating that will also update VPM so try that first.