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You can apply redeem code to install Premium Add-on for Chinese and Japanese language.
How to install Premium Add-on using redeem code
Step 1: Sign in on GlotDojo page with your account.
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Step 2: Open Redeem in your Account Settings
Step 3: Enter the code you receive in the following box:
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Step 4: After entering the code, click Redeem. You have successfully purchased Premium Add-on.
After successfully purchasing Premium Add-on with redeem code, you need to download the dictionaries to be able to look up words with the Premium Add-on.