Simply upload all avatars via FTP to a folder in your forum root. For example forums/avatars/
Then go into your admincp and select Avatars from the menu on the left and click add avatars from the dropdown menu on the left. Then in the admincp screen there will be an option to upload multiple avatars, enter the proper file path to the folder in which your avatars were uploaded to, select how many you wish to be uploaded at a time, and click OK.
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