error no 1636963595

I installed zotfile 4.0 over 3.1 in Zotero Standalone and got this error message.
I also got a more explicit message saying something like:
Zotfile source folder invalid. please change zotfile folder. You might need to use a personalised folder.
I imported the xpi file from the download folder. I have to change this ? Or does it mean that the zotero data files have to be in my previous data location which is C:\Users\Toshiba\Dropbox\zotero
I don't understand the error message.
Thanks for some hints?
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