The crash report looks like this
==========================================================================================================================
Executing gradle command: cleanCache clean setupDecompWorkspace --refresh-dependencies
Support for running Gradle using Java 6 has been deprecated and will be removed in Gradle 3.0
FAILURE: Build failed with an exception.
* Where:
Build file '/Users/macbookpro/Desktop/MCreator 1.7.9 [1.12.2] Mac-Linux 32-64bit/forge/build.gradle' line: 10
* What went wrong:
A problem occurred evaluating root project 'forge'.
> java.lang.UnsupportedClassVersionError: net/minecraftforge/gradle/user/patcherUser/forge/ForgePlugin : Unsupported major.minor version 52.0
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 1 mins 3.233 secs
Task completed with return code 1 in 69229 milliseconds
==========================================================================================================================
I dont really know what to do
You are using Java 6. MCreator needs Java 8 to be default JVM on the Mac in order to work. Check: https://mcreator.net/install/mac