Add an app to the launcher
If you know the command line to launch the software from the terminal, I suggest using 'Menu editor' available in the Software center to resolve your issue - adding the launcher to the Gnome apps.
For example
The command line for opening ImageJ that is extracted to my 'Home' folder is java -jar /home/dr/ij153-linux64-java8/ImageJ/ij.jar
The above command shall be used to create the launcher using the Menu editor.