First go to Admin CP -> vBET -> Main and set your additional directories in Keep Directories parameter.
For next step we have 2 cases here:
a) Your forum is using subdirectory in URL so you need to support content outside forum directory.
In such case just fallow instructions in this article: FAQ
b) Your forum is not using subdirectory in URL, so all directories added by mods are subdirectories of forum URL
In such case check does it is working right now. If not then add to .htaccess file in your forum main directory this rule (BEFORE other vBET rules):
Code:
RewriteRule ^/?(af|sq|ar|be|bg|ca|zh-CN|hr|cs|da|nl|en|et|tl|fi|fr|gl|de|el|iw|hi|hu|is|id|ga|it|ja|ko|lv|lt|mk|ms|mt|no|fa|pl|pt|ro|ru|sr|sk|sl|es|sw|sv|zh-TW|th|tr|uk|vi|cy|yi)/ADDITIONAL_DIRECTORY/(.*)?$ /ADDITIONAL_DIRECTORY/$2?language=$1 [L,QSA]
Please note that you have to change there ADDITIONAL_DIRECTORY to your directory name and you need such rule for each additional directory which you want to support and which is not working. Also please note that it is mostly needed when vBSEO is used.