    * Upload files (zip -> /upload)
    * chmod directory '/images/vbsoccer' -> 777
    * install add-on (zip -> product-vbsoccer-***.xml) -> depending on the charset of your database / html output AND language version of the vBulletin installation
    * after installation -> acp -> league manager -> add league...
    * then create a new forum with a link to the file 'vbsoccer.php' (necessary!)

done.