diff --git a/bashclub-zsync/DEBIAN/postinst b/bashclub-zsync/DEBIAN/postinst
index 462ce34..b8e5019 100644
--- a/bashclub-zsync/DEBIAN/postinst
+++ b/bashclub-zsync/DEBIAN/postinst
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
+
 if [ ! -d /var/log/bashclub-zsync ]; then
   mkdir -p /var/log/bashclub-zsync
 fi
\ No newline at end of file
diff --git a/bashclub-zsync/DEBIAN/preinst b/bashclub-zsync/DEBIAN/preinst
index cc1f786..6972d2d 100644
--- a/bashclub-zsync/DEBIAN/preinst
+++ b/bashclub-zsync/DEBIAN/preinst
@@ -1 +1,12 @@
-#!/bin/bash
\ No newline at end of file
+#!/bin/bash
+
+PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
+
+# check if script is installed manually on system and rename an remove execute flag
+if ! dpkg -l bashclub-zsync  > /dev/null 2>&1; then
+    if which bashclub-zsync > /dev/null 2>&1; then
+        zsync=$(which bashclub-zsync)
+        mv ${zsync} ${zsync}.legacy
+        chmod -x ${zsync}.legacy
+    fi
+fi
\ No newline at end of file