PHP Code:
ALTER TABLE TABLE_PREFIX_forum ADD (sponsor_enabled INT(6) UNSIGNED NOT NULL DEFAULT '')
ALTER TABLE TABLE_PREFIX_forum ADD (sponsor_banner_enabled INT(6) UNSIGNED NOT NULL DEFAULT '')
ALTER TABLE TABLE_PREFIX_forum ADD (sponsor_name VARCHAR(250) NOT NULL DEFAULT '')
ALTER TABLE TABLE_PREFIX_forum ADD (sponsor_banner VARCHAR(250) NOT NULL DEFAULT '')
ALTER TABLE TABLE_PREFIX_forum ADD (sponsor_url VARCHAR(250) NOT NULL DEFAULT '')
Replace TABLE_PREFIX with the prefix of your vB tables. Let me know the results.