Trial version is limited to the first four cameras connected to the DVR. NOTE: Audio is not currently supported. Feature: Customizable viewing screen that lets you view from 4 to 20 cameras on each page.

I don't have an exact answer but I have (probably) the same unit. Buggy software, clumsy web interface.
I use IP Cam Viewer Pro which is an android app...but... I use Blue Stacks on my laptop (Dell XT3) and I can use/view my cameras with it. As far as playback, yes it does have record/playback but I haven't used it but all the options are there for searching, etc.

Dahua Dvr Viewer Windows

IP Cam Viewer Pro is a paid app but the author is fantastic in keeping up with the latest dvr's, cameras, etc.

I also use it with my wireless ip cams... ptz cams... and it works wonderfully.

Dvd Viewer Windows 10

-shawn