I have installed qtVlm 5.9.5 and it is working very well, being launched from its directory.
I am not able however to launch it from the desktop. A copy of the file “qtVlm.desktop” was placed in the folder “user/share/applications” where the other applications are also found (the use of a sudo command was necessary) but launching from there is not possible (Permission denied) and qtVlm does not appear on the desktop (under “Other”). Changing permission level seems not possible.
I do not know much about Linux . . . but I found a solution by searching the Internet: I used the command “sudo chmod 777 /usr/share/applications/qtVlm.desktop”. This changed the permissions of the file and qtVlm appears now on the desktop under “Other” and launches from there.