diff --git a/installation/build.gradle b/installation/build.gradle
index 2fb2f13b9c2feaf9a0c3857b7bd77ed39ca31195..39b46f390d9b8cc240c77317c14e91885edfd9f0 100644
--- a/installation/build.gradle
+++ b/installation/build.gradle
@@ -167,9 +167,6 @@ task createInstallerJar(type: Jar, dependsOn: [compileInstaller, jar]) {
     for (f in configurations.archives.files) {
         from zipTree(f)
     }
-    manifest {
-        attributes('Main-Class' : 'com.izforge.izpack.installer.bootstrap.Installer')
-    }
 }
 
 task createInstallerZip(type: Tar, dependsOn: createInstallerJar) {
diff --git a/installation/resource/tarball/run-console.sh b/installation/resource/tarball/run-console.sh
index 3593973e0dbe5dfb5e3ccfe4fdcccbe2eb7b6781..8dd8b38d386547ea6c91bb42b43808ea63d53112 100755
--- a/installation/resource/tarball/run-console.sh
+++ b/installation/resource/tarball/run-console.sh
@@ -84,4 +84,4 @@ else
   readAdminPassword
 fi
 
-java -Djava.util.logging.config.file=$BASE/jul.config -DADMIN_PASSWORD=$ADMIN_PASSWORD -DCONSOLE=true -Dmerge.props.to.installation.vars=true -jar $BASE/openBIS-installer.jar -options-auto $BASE/console.properties
+java -Djava.util.logging.config.file=$BASE/jul.config -DADMIN_PASSWORD=$ADMIN_PASSWORD -DCONSOLE=true -Dmerge.props.to.installation.vars=true -cp $BASE/openBIS-installer.jar com.izforge.izpack.installer.bootstrap.Installer -options-auto $BASE/console.properties
diff --git a/installation/resource/tarball/run-ui.sh b/installation/resource/tarball/run-ui.sh
deleted file mode 100755
index c6faf8bb4c7ff0253ebeeef86a4526943663199a..0000000000000000000000000000000000000000
--- a/installation/resource/tarball/run-ui.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/bin/bash
-
-#Detect Java version
-
-if type -p java; then
-    _java=java
-else
-    echo "Java not available"
-	exit -1
-fi
-
-if [[ "$_java" ]]; then
-    version=$("$_java" -version 2>&1 | awk -F '"' '/version/ {print $2}'| cut -c1-3)
-    if [[ "$version" == "1.8" || "$version" == "11." ]]; then
-        echo Java version $version found.
-    else
-        echo Java version $version found is neither 1.8 or 11.
-        exit -1
-    fi
-fi
-
-#Continue installation
-
-BASE=`dirname "$0"`
-if [ ${BASE#/} == ${BASE} ]; then
-    BASE="`pwd`/${BASE}"
-fi
-
-java -Djava.util.logging.config.file=$BASE/jul.config -jar $BASE/openBIS-installer.jar
\ No newline at end of file