Deinstall software Paket is unfortunately not the best solution. because most of the customers don't allow you to deinstall software.
Regarding my question, I found the solution.
Under C:\KRC\USER\MaintenanceMsg you will find MaintenanceMsgConfig.xml
open the file
QuoteDisplay More<?xml version="1.0" encoding="utf-8"?>
<MaintenanceMSGConfig xmlns:xsi="http://www.w3.org/2001/
XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/
XMLSchema">
<WaitTimeInSec>120</WaitTimeInSec>
<Text>
Achtung!
Bevor Sie รnderungen
an Programmen vornehmen,
bitte die Roboterwerkstatt informieren!
</Text>
</MaintenanceMsgConfig>
and change the time to 0 (default is 120 sec) and the Message will be disabled.
to be sure that the software disabled, you can check it MaintenanceMsg.log under C:\KRC\ROBOTER\Log
Thank you