I don't want to donate to support development of popup windows, watermarks, dll modifying protection(yeah, i checked, sorry ), license checking system and other things like that. It can be cracked anyway, so all drm systems are waste of time. No offense, just an opinion. I agree with these three people too. Watermark on the final version? No way. I think this program is gonna be cracked as it was done with Aero Glass for Windows 8. Sorry if I did not post what I think, I'll rewrite: I want to make a donation to support developers and at the same time to have a license. Oh you can ask me, but why? Why besides supporting developers want to have something complete. Do not have a way to write the way I think, I know how is the job for you, also have a "work" in this area, but other than that you develop for Windows I develop for Android. I know that my answer was not what you expected. But simple answer could also be "donate how much you value it" all other information is already written on my website. And BTW, such answers of bigmuscle just proves that you can‘t always perceive word ‘donation’ literally.