Hello,

I just downloaded and purchased the professional version (X64 version for Windows 10) as I also want to record video.
Before that I've used the free version without problems for a long time.
Now after installation of the professional version I immediately was able to use it (I guess the settings were copied from the installed free version) but I have a constant flicker on all channels.
I entered the registration code but that didn't help.
What may be the reason for this? Do I need to uninstall the free version?
Thanks!

Hello.
This not depended from license type. But very depended from video driver and video card. May be need restart of PC.
In any case you can try change video renderer in Options->Video->Codecs. For example to EVR

Thank you, changed to EVR instead of EVR Custom and it seems to work.