unusable Extentions in kstars 3.5.5

[tm]

hello people,
why can i not save extended data under win10pro.
The installation of extensions will be downloaded and will no longer be 
displayed or loaded the next time the program is started.
The procedure has already been tried several times, unfortunately 
without success.
That means I can't view star catalogs, tumpnails, etc. !!!
This applies to all post-installable extensions.
Why is that and where is the temp data stored.
Kind regards
Thomas Martinez
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