How to install updates if you don't have admin privileges to the PC?
Also--if I install new version, will I lose my collections?
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Upgrade Storage
It is possible to install Zotero as a non-admin user and then you can also update it yourself -- don't try this if you still have an admin version installed, though; that won't work.
Re-installing Zotero will not cause you to lose any data, no. Neither re-installing nor a typical uninstall will remove your Zotero data. That said, you should, as with all important data, always have a back-up of your Zotero library:
https://www.zotero.org/support/zotero_data#backing_up_your_zotero_library
And if you already tried reimporting an RDF file, it means you created duplicate items in your library.
Thanks!
Just wanted to spell out how this all looks from the user's point of view, because I think it suggests several changes that are needed in the product itself.