It's a fairly straight-forward process, Natalie. You can most likely do it yourself. Head over to Microsoft Dynamics NAV 2013 CU website (official link), select the Cummulative Update that you want (most likely the latest available), scroll to the bottom (-ish), click on the download link, select the country version (DE, I'm guessing) and the where to download. When it's done, unpack it and inside there should be another archive, that should be called something like "NAV.7.0.XXXXX.YY.DVD.zip", where XXXXX is the build number of the update, and YY - country code. Unpack that archive and you can run "Setup.exe", select what options you want - Demo (should install everything you need using default configuration) or custom (client, server, development environment, any other features - can select just the things you really need) and install. At the end you should have an icon on your Start Menu to run NAV 2013
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No PM,please use the forum. || May the <SOLVED>-attribute be in your title!
hahaha ... no thanks...
a very nice and talented forum member has (within a few minutes) already eliminated the problem.