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I can download the dictionary, but there seems no way to install it.

这个评论是针对附加组件的一个早期版本的(3.1.8)。 

Heya, Dave,

Read the instructions here:
https://proofingtoolgui.org/en_installing.html

Basically, you can simply open the tools → add-ons → dictionaries, and drag'n'drop the .xpi file into this window.

评分1星,满分5星

How do you install it? There are no instructions and none of the suggestions on various forums work. (i.e. there is no 'install now' option).

这个评论是针对附加组件的一个早期版本的(3.0.5)。 

https://proofingtoolgui.org/en_installing.html