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Hiya gerd3d,
And welcome to XOOPS :)
You have upload the files correctly and XOOPS is there. I think that your problem is that Your server can't find the install files, its yourself that has kinda got the wrong URL to the install files :)
Its not URL/upgrade/install/index.php
Its URL/install/index.php
I hope that this help you get XOOPS installed and to get you playing with it :)
For the rest of you. don't be so condesending to new people it promotes the wrong kind of image and if you had taken the time to look at the URL you would have noticed that mistake.
John