Please can you try again now with latest version DualSPHysics_v4.4.05.zip
we have uploaded in https://dual.sphysics.org/index.php/downloads/
I suspect that this might also address the problem (of the same) that I was having as well, so I'll try this out and hopefully this will work.
I downloaded the latest version, and it worked well !!!
Thanks a lot for the work of DualSPHysics team.☺️