I use latest version for Linux (Alpha16 Patch3).
According to official guide:
Installation
1) (from web) Download The Spellcheck Zip Install Package, e.g.: en-US.zip
2) (from WPS) Review --> Set Spellcheck Language --> Install, and choose en-US.zip
But I can't find "Install" button:
How to change spell check language?
updated for version 10.1
The extracted directory from downloaded archive (e.g. en_US, fr_FR, etc) can be put in
/opt/kingsoft/wps-office/office6/dicts
(all users) but also in~/.kingsoft/office6/dicts
(for each user).Some dictionaries come with improper names. In each language-folder (e.g. fr_FR) the files have to be renamed so the package of each language has (at least) three files with the following names:
dict.conf
main.aff
main.dic
Review --> Spell Check --> Set Language --> Set Default
UPDATE: Ubuntu 18.04 with WPS 10.1, name and location of the dictionaries was not the decisive factor in my case: the new dictionaries would not appear in the list (under Review --> Spell Check --> Set Language --> Set Default) unless they were first added under Review --> Spell Check --> Spell Check --> Custom dictionaries --> Add.
And there added from any location without changing their names - only then resulting in them being listed as indicated initially under Review --> Spell Check --> Set Language --> Set Default.
I had a slightly different issue/variations: Running Ubuntu 16.04 and installed WPS Office via Snap
(First issue (off-topic) was a complaint about symbol fonts so I had to find and install them.)
With a Snap installation the dictionaries for me are installed under ~/snap/wps-office/1/.kingsoft/office6/dicts
Just don't extract the zip in a way that results in the files being owned by root. WPS Office won't be able to read the files (I learnt the hard way).
It's possible I didn't have to "add custom dictionary"; I can't be sure now, but I've since deleted their entries and I can view and switch my dictionary "Review > Spell Check > Set Language > (Default)" as normal.