Problems launching 5.0
This discussion was created from comments split from: Now available: Zotero 5.0.
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2) FWIW, when I tried to download the old extension from Zotero.org, it was no longer avail on the website.
https://www.zotero.org/support/quick_start_guide#how_do_i_install_it
When you close the window, it shuts down the program, and you have to relaunch it. If that's not happening for you, something's wrong.