jt100

hello, I'm trying to download forge 1.12.2 on Mac and the download keeps getting stuck downloading libraries here is the installer log checksums.sha1 was not found, validation failed Downloading library org.scala-lang.plugins:scala-continuations-library_2.11:1.0.2 Unpacking packed file scala-continuations-library_2.11-1.0.2.jar.pack.xz Signed Checksum Length: 2416 Total Length: 18871 Temp File: /var/folders/cs/3yqys74n5h32wryp8_l4mndm0000gn/T/art17025133548810071921.pack Exception in thread "main" java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at net.minecraftforge.installer.Java6Gate.main(Java6Gate.java:48) Caused by: java.lang.NoClassDefFoundError: java/util/jar/Pack200 at net.minecraftforge.installer.DownloadUtils.unpackLibrary(DownloadUtils.java:253) at net.minecraftforge.installer.DownloadUtils.downloadInstalledLibraries(DownloadUtils.java:89) at net.minecraftforge.installer.ClientInstall.run(ClientInstall.java:131) at net.minecraftforge.installer.InstallerAction.run(InstallerAction.java:43) at net.minecraftforge.installer.InstallerPanel.run(InstallerPanel.java:406) at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:168) at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:54) ... 5 more Caused by: java.lang.ClassNotFoundException: java.util.jar.Pack200 at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ... 12 more