I cannot install the application using tresheets.desktop in Ubuntu version 20.04

[suk...@gmail.com]

In Other Application, I selected Run Software, but it still does not run.

I tried the gtk-launch command and moving the .dektop file to the /share/applications path, but it was still not installed.

Instead, I used the Ubuntu 'apt' package installation, but the program runs normally, but the icon of the program does not appear. Also, I doubt if it's the latest version.

Restarting my computer will not resolve the issue. Please tell me how to install it normally.