Revolution slider breaks after recent update v 6.0.4

Our website is experiencing BLANK slider holders on 2 out of 4 pages. 2 pages, the sliders are working, but on 2 pages they do not. When I open slider revolution on my Highend theme dashboard, it says the product is not registered and demands registration number or purchase payment. The sliders have been working just fine the last 2 years, until this particular update.