Run this query:
ALTER TABLE `".TABLE_PREFIX."warnings` ADD COLUMN `caused_ban` char(1) AFTER warned_warning_id
TABLE_PREFIX is a prefix you have specified, when you installed your vB. It is added in front of each table name. From the message above, you do not seem to need one, so just delete the ".TABLE_PREFIX." from the query above.
You are obviously trying to upgrade to the latest version, form an older one, but not from the previous one. In order to do it, you have to do all the upgrade steps, described in the UpgradeToLatestVersion.txt file, starting from the version you have installed already.
Rgds
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