Simple place the following statement in your login script. Not your Kixtart script.

code:

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%0\..\kix361update.exe

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Another call can be:

code:

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if not exit c:\kix362.ok %0\..\kix361update.exe

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Procedure check automatically for a neccessary update. During an update it creates the c:\kix362.ok file.
The last version prevents a check each time. The last version is required. It is optional.
Greetings.