[Ron1n]

I just uninstalled.. but it gave this error

Invalid SQL: ALTER TABLE vb3_user DROP uploads;
mysql error: Can't DROP 'uploads'. Check that column/key exists

well, then there are two possibilites. 1) you ran his script, 2) you didnt run the upgrade script
run each of these queries 1 by 1, if any fail... ignore them.
ALTER TABLE vb3_user ADD uploads int(11) UNSIGNED DEFAULT 0 NOT NULL
ALTER TABLE vb3_user ADD downloads int(11) DEFAULT 0 NOT NULL
ALTER TABLE vb3_user ADD downloadtime int(11) DEFAULT 0 NOT NULL
ALTER TABLE vb3_user ADD lastdownload varchar(50) NOT NULL

note: only deviant should run this