Is the polybrush software free to download?Because there is no more beta testing.
Perhaps the version you had has expired. Have you downloaded the new file?
But that page says free beta test until januarary6,2016.Meaning the time has already expired.
there are different ways to write the date and the developer uses Day/Month/Year
the counter says you have currently ~43 days till release
download the newest version and you can betatest it till June, after that it will most likely cost ~$20.