Warning: starting with Java 11 JavaFX is a separate project so JavaFX must be downloaded and installed separately (see https://openjfx.io/)
Once installed, you can run the application by terminal using a command like
java -jar --module-path "Path where JavaFX has been installed" --add-modules javafx.controls,javafx.web "Path where the executable of JQSARINS-Chem il located"
Examples are (assuming the terminal is already pointing to the folder where JqsarinsChem.jar il located):
(Windows)
java -jar --module-path "C:\Program Files\Java\javafx-sdk-19\lib" --add-modules javafx.controls,javafx.web JqsarinsChem.jar
(Linux/Mac)
java -jar --module-path /usr/share/openjfx/lib --add-modules javafx.controls,javafx.web JqsarinsChem.jar