How to uninstall and reinstall without loosing my library ?

I have a Problem connecting Word to Zotero. It worked but I used Zotero from the installation Drive and not from Applications (Mac). Now when I use Zotero , Word doesn't 'see' it. I tried to follow a procedure telling me to delete extension.json but I am not finding the datas...
Anyway I think for me the best thing to do is to uninstall and then reinstall Zotero.
I have an account and I synchronised my library online. Now the question is : how to uninstall, reinstall and download my library without loosing anything ? Did the quotes I did in my word document will be saved ?
Thanks
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