actually I found out that normal registered users can create private comments, which is also not obvious from the docs as they are not selectable in the roles settings.

That's not quite what I wanted to have (didn't want to require my users to register at all) but it is at least a solution for now.

So thanks, I won't ask for the refund. But please update your docs to clarify what this plugin is capable of and how.

If you want, we can refund the wpDiscuz Private Comments add-in, just contact us via supportgvectors.com email address and ask for a refund.

I don't see the problem with the devices: Guests are also able to edit their comments only on the device they created it and that seems to be ok. 

How can it be, that after at least two years and having 4 of 17 Threads open about this topic, the description of the plugin does still not reflect that circumstance?

The plugin is useless for me that way. 20$ wasted, thanks for nothing.

Sorry for the late response. 

This is designed to work in this way. I'm really sorry, but the private comment button is available only for registered users. 

It's too hard to handle this for guests. For example, if the guest makes a private comment on one device, it's not possible to detect and show the private comment to the current guest if s/he uses another device.

Thank you for your purchase. 

 DOES IT SUPPORT for visitors(user not logged in)

Please wait a bit. I'll need to ask the add-on developers this question. 

But after install I noticed that private comment not available for visitors while image uploader is working properly. I couldn't see the private mark if I visit as a visitor. 

My question is DOES IT SUPPORT for visitors(user not logged in)? or DID I MISS SOME SETTING ?