Hi Sebastian,
thank you for your help
i just upgrade since 5.6.3 to 6.0.2 and i see that the 6.1.0 version is online now,
i have just some problem on 6.0.2 with language , when i clik on English (select language from the home page) and only for one website (we have others) i have this error :

[ArgumentNullException: Value cannot be null. 
Parameter name: file] DotNetNuke.Common.Requires.NotNull(String argName, Object argValue) +48 
DotNetNuke.Services.FileSystem.FileManager.GetUrl(IFileInfo file) +49 
DotNetNuke.Services.Exceptions.ErrorPage.OnLoad(EventArgs e) +137 
System.Web.UI.Control.LoadRecursive() +50 
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

also the skin of this website is "MinimalExtropy Index LeftMenu" and impossible to run correctly,
 i change by "DarkKnight 3Column StandardMenu" and it run correcly, 
what about the skin MinimalEytropy, I have to delete it or are there a upgrade?

I want to reverse to 5.6.3 and upgrade to 6.1.0 , can you say if it is a good way or does i upgrade since 6.0.2 to 6.1.0 ?
if you take a look to the upgrade package "Install=>Modules",  there is not the same files in the different package ,
more files in 6.0.2 than 6.1.0 ?
have you the tatest German language pack  please ?
Best regards 

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Cheers from France, Michel