diff --git a/Installer/pkgPostInstall.sh b/Installer/pkgPostInstall.sh
index 9805eb5f..babb41e8 100644
--- a/Installer/pkgPostInstall.sh
+++ b/Installer/pkgPostInstall.sh
@@ -1,2 +1,18 @@
 #!/bin/sh
-~/Library/Input\ Methods/vChewing.app/Contents/MacOS/vChewing install --all
+loggedInUser=$(stat -f%Su /dev/console)
+
+# First, copy the wrongfully installed contents to the right location:
+cp -r /Library/Input\ Methods/vChewing.app /Users/$(stat -f%Su /dev/console)/Library/Input\ Methods/ || true
+cp -r /Library/Keyboard\ Layouts/vChewing* /Users/$(stat -f%Su /dev/console)/Library/Keyboard\ Layouts/ || true
+chown "$loggedInUser" /Users/$(stat -f%Su /dev/console)/Library/Input\ Methods/vChewing.app || true
+chown "$loggedInUser" /Users/$(stat -f%Su /dev/console)/Library/Keyboard\ Layouts/vChewing* || true
+
+sleep 1
+
+# Second, clean the wrongfully installed contents:
+rm -rf /Library/Input\ Methods/vChewing.app || true
+rm -rf /Library/Keyboard\ Layouts/vChewing* || true
+sleep 1
+
+# Finally, register the input method:
+/Users/$(stat -f%Su /dev/console)/Library/Input\ Methods/vChewing.app/Contents/MacOS/vChewing install --all || true
diff --git a/Installer/pkgPreInstall.sh b/Installer/pkgPreInstall.sh
index 82d041b5..fc3cb9a6 100644
--- a/Installer/pkgPreInstall.sh
+++ b/Installer/pkgPreInstall.sh
@@ -1,5 +1,18 @@
 #!/bin/sh
-killall vChewing
+loggedInUser=$(stat -f%Su /dev/console)
+
+killall vChewing || true
+
+if [ "$loggedInUser" = root ]; then
+    rm -rf /Library/Input\ Methods/vChewing.app || true
+    rm -rf /Library/Keyboard\ Layouts/vChewingKeyLayout.bundle || true
+    rm -rf /Library/Keyboard\ Layouts/vChewing\ Dachen.keylayout || true
+    rm -rf /Library/Keyboard\ Layouts/vChewing\ ETen.keylayout || true
+    rm -rf /Library/Keyboard\ Layouts/vChewing\ FakeSeigyou.keylayout || true
+    rm -rf /Library/Keyboard\ Layouts/vChewing\ IBM.keylayout || true
+    rm -rf /Library/Keyboard\ Layouts/vChewing\ MiTAC.keylayout || true
+fi
+
 rm -rf ~/Library/Input\ Methods/vChewing.app
 rm -rf ~/Library/Keyboard\ Layouts/vChewingKeyLayout.bundle
 rm -rf ~/Library/Keyboard\ Layouts/vChewing\ Dachen.keylayout