Need help with opening mcreator.command

I installed the download .dmg image, I followed the instructions to put into a different folder and set privileges to 'Read and Write'. Then when trying to open 'mcreator.command', the terminal opened and displayed a load of code (shown below).

Last login: Tue Mar 26 16:02:57 on ttys001
/Users/bobbietapping/Desktop/MCreator/MCreator183/mcreator.command ; exit;
Roberts-MBP:~ bobbietapping$ /Users/bobbietapping/Desktop/MCreator/MCreator183/mcreator.command ; exit;
[Tue Mar 26 16:13:09 GMT 2019] [Launcher] Java version: 1.8.0_202, specification: 1.8, VM name: OpenJDK 64-Bit Server VM, VM vendor: BellSoft
[Tue Mar 26 16:13:09 GMT 2019] [Launcher] Current JAVA_HOME for running instance: /Users/bobbietapping/Desktop/MCreator/MCreator183/jdk/Contents/Home/jre
[Tue Mar 26 16:13:09 GMT 2019] Failed to init MCreator Theme! Error Problem reading font data.
[Tue Mar 26 16:13:09 GMT 2019] Exception in thread "main" [Tue Mar 26 16:13:09 GMT 2019] java.lang.UnsatisfiedLinkError: /Users/bobbietapping/Desktop/MCreator/MCreator183/jdk/Contents/Home/jre/lib/libfontmanager.dylib: dlopen(/Users/bobbietapping/Desktop/MCreator/MCreator183/jdk/Contents/Home/jre/lib/libfontmanager.dylib, 1): Library not loaded: /opt/local/lib/libpng16.16.dylib
  Referenced from: /Users/bobbietapping/Desktop/MCreator/MCreator183/jdk/Contents/Home/jre/lib/./libfreetype.6.dylib
  Reason: image not found
[Tue Mar 26 16:13:09 GMT 2019] 	at java.lang.ClassLoader$NativeLibrary.load(Native Method)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1845)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.lang.Runtime.loadLibrary0(Runtime.java:870)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.lang.System.loadLibrary(System.java:1122)
[Tue Mar 26 16:13:09 GMT 2019] 	at sun.lwawt.macosx.LWCToolkit$1.run(LWCToolkit.java:93)
[Tue Mar 26 16:13:09 GMT 2019] 	at sun.lwawt.macosx.LWCToolkit$1.run(LWCToolkit.java:80)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.security.AccessController.doPrivileged(Native Method)
[Tue Mar 26 16:13:09 GMT 2019] 	at sun.lwawt.macosx.LWCToolkit.<clinit>(LWCToolkit.java:79)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.lang.Class.forName0(Native Method)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.lang.Class.forName(Class.java:264)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.awt.Toolkit$2.run(Toolkit.java:860)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.awt.Toolkit$2.run(Toolkit.java:855)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.security.AccessController.doPrivileged(Native Method)
[Tue Mar 26 16:13:09 GMT 2019] 	at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:854)
[Tue Mar 26 16:13:09 GMT 2019] 	at sun.swing.SwingUtilities2.getSystemMnemonicKeyMask(SwingUtilities2.java:2020)
[Tue Mar 26 16:13:09 GMT 2019] 	at javax.swing.plaf.basic.BasicLookAndFeel.initComponentDefaults(BasicLookAndFeel.java:1158)
[Tue Mar 26 16:13:09 GMT 2019] 	at javax.swing.plaf.metal.MetalLookAndFeel.initComponentDefaults(MetalLookAndFeel.java:431)
[Tue Mar 26 16:13:09 GMT 2019] 	at javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:148)
[Tue Mar 26 16:13:09 GMT 2019] 	at javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1577)
[Tue Mar 26 16:13:09 GMT 2019] 	at javax.swing.UIManager.setLookAndFeel(UIManager.java:539)
[Tue Mar 26 16:13:09 GMT 2019] 	at co.pylo.mcreator.Launcher.main(SourceFile:66)
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

[Process completed]

I then went on the website to troubleshoot and got told to enter a command into the terminal, 'brew reinstall libpng', in which it returned this...

Last login: Tue Mar 26 16:13:09 on ttys000
Roberts-MBP:~ bobbietapping$ brew reinstall libpng
-bash: brew: command not found
Roberts-MBP:~ bobbietapping$ 

I am currently running MacOS Mojave v10.14.3 on MacBook Pro 2018.

I am out of solutions so if someone could help that would be great,

many thanks,

Bobbie.