zotero 5.087 out of use

The PDF button is displayed on the web page, but I can't save it after clicking it. This document is in Chinese。
Ask everyone how to adjust?
If you need a plugin update, how do you update it?
I downloaded this plugin and found it directly from the 360 browser plugin app market。

https://s3.amazonaws.com/zotero.org/images/forums/u7209242/lfb98iaupg6lfmuby6gl.png
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