Thank you, I did that and it solved the problem. I only hope that the watermark will not return after another 30 days trial period.

I installed Helikon 6.1.0 on my PC under Windows 8.1. I bought a licence (Helicon Focus lite for 22,70 €) and activated it online using the activation key I had received by email. Activation was successful.The licence is valid for more than 270 days. Despite that I get after the 30 days of licence ...