diff --git a/jes_bigsur.sh b/jes_bigsur.sh
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--- /dev/null
+++ b/jes_bigsur.sh
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+#!/bin/sh
+# Launches JES in place on Mac and Linux.
+
+# Where are we?
+
+JES_BASE=`pwd -P`
+JES_HOME="$JES_BASE/jes"
+JES_JAVA_HOME="/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home"
+
+
+InfoPlistFile="$JES_BASE/Info.plist"
+
+# read the program name from CFBundleName
+CFBundleName=`/usr/libexec/PlistBuddy -c "print :CFBundleName" ${InfoPlistFile}`
+
+# read the icon file name
+CFBundleIconFile=`/usr/libexec/PlistBuddy -c "print :CFBundleIconFile" ${InfoPlistFile}`
+
+# See if there's a user configuration file...
+
+if test -d "$HOME/Library/Application Support"; then
+    JESCONFIGDIR="$HOME/Library/Application Support/JES"
+    JES_USER_PLUGINS="$HOME/Library/Application Support/JES/Plugins"
+else
+    JESCONFIGDIR="${XDG_CONFIG_HOME:-$HOME/.config}/jes"
+    JES_USER_PLUGINS="${XDG_DATA_HOME:-$HOME/.local/share}/jes/plugins"
+fi
+
+if test -f "$JESCONFIGDIR/JESEnvironment.sh"; then
+    source "$JESCONFIGDIR/JESEnvironment.sh"
+fi
+
+
+
+# What Java should we use?
+
+if ! test -z "$JES_JAVA_HOME"; then
+    JAVA="$JES_JAVA_HOME/bin/java"
+elif ! test -z "$JAVA_HOME"; then
+    JAVA="$JAVA_HOME/bin/java"
+else
+    JAVA="`/usr/libexec/java_home  -v 1.8`/bin/java"
+fi
+
+# ...Did we find one?
+
+if [ ! -x "$JAVA" ]; then
+    # display error message with applescript
+    osascript -e "tell application \"System Events\" to display dialog \"Error launching ${CFBundleName}!\n\nYou need to have Java installed on your Mac!\nVisit http://java.com for more information.\" with title \"${CFBundleName}\" buttons {\"OK\"} default button 1 with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"
+
+    # exit with error
+    exit 1
+fi
+
+
+# Where's our Java code?gt
+
+JARS="$JES_BASE/dependencies/jars"
+
+CLASSPATH="$JES_HOME/classes.jar"
+
+for jar in "$JARS"/*.jar; do
+    CLASSPATH="$CLASSPATH:$jar"
+done
+
+# Where's our Python code?
+
+PYTHONHOME="$JES_BASE/dependencies/jython"
+
+PYTHONPATH="$JES_HOME/python:$JES_BASE/dependencies/python"
+
+
+# Do we have any plugins to load?
+# User plugins:
+JES_USER_PLUGINS="$HOME/Library/Application Support/JES/Plugins"
+
+if test -d "$JES_USER_PLUGINS"; then
+    for jar in "$JES_USER_PLUGINS"/*.jar; do
+        CLASSPATH="$CLASSPATH:$jar"
+    done
+fi
+
+# System plugins:
+
+JES_SYSTEM_PLUGINS="$JES_BASE/plugins"
+
+if test -d "$JES_SYSTEM_PLUGINS"; then
+    for jar in "$JES_SYSTEM_PLUGINS"/*.jar; do
+        CLASSPATH="$CLASSPATH:$jar"
+    done
+fi
+
+# Built-in plugins:
+
+JES_BUILTIN_PLUGINS="$JES_HOME/builtin-plugins"
+
+if test -d "$JES_BUILTIN_PLUGINS"; then
+    for jar in "$JES_BUILTIN_PLUGINS"/*.jar; do
+        CLASSPATH="$CLASSPATH:$jar"
+    done
+fi
+
+# Where should the Jython cache live?
+
+PYTHONCACHE="$HOME/Library/Caches/JES/jython-cache"
+
+mkdir -p $PYTHONCACHE
+
+
+# What about JESConfig.properties?
+
+JESCONFIG=$JESCONFIGDIR/JESConfig.properties
+
+mkdir -p "$JESCONFIGDIR"
+
+
+# Enable drag & drop to the dock icon.
+
+export CFProcessPath="$0"
+
+# All right, time to actually run it!
+
+exec "$JAVA" \
+    -classpath "$CLASSPATH" \
+    -Xdock:icon="${CFBundleIconFile}" \
+    -Xdock:name="${CFBundleName}" \
+    -Dfile.encoding="UTF-8" \
+    -Djes.home="$JES_HOME" \
+    -Djes.configfile="$JESCONFIG" \
+    -Djes.plugins.user="$JES_USER_PLUGINS" \
+    -Djes.plugins.system="$JES_SYSTEM_PLUGINS" \
+    -Djes.plugins.builtin="$JES_BUILTIN_PLUGINS" \
+    -Dpython.home="$PYTHONHOME" \
+    -Dpython.path="$PYTHONPATH" \
+    -Dpython.cachedir="$PYTHONCACHE" \
+    -Dapple.laf.useScreenMenuBar=true \
+    ${JES_JAVA_MEMORY:--Xmx512m} ${JES_JAVA_OPTIONS} \
+    JESstartup "$@"
+