Zotero stopped working after update

I just updated zotero and it stopped working. It asks me to download another program (see image, in Swedish...) and I write my password and nothing happens. I reinstalled connector but a I am afraid to loose all my files if I download Zotero again.
https://s3.amazonaws.com/zotero.org/images/forums/u369227/zvaklgr1n82btbr7h7s4.png
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