[gcphost]

If you always got the above error theres nothing you need to undo as it didnt work. To be sure load up a mysql editor and check it out.

You have to modify the prefix to the table as it says:

Remember to prefix the table, if you do not know what is a prefix or
you don't use it then you can run the queries without any changes

--------------------------------------------------------

ALTER TABLE attachment add usedin varchar(30) not null;
ALTER TABLE attachment add itemid int not null;
ALTER TABLE pmtext add attach int not null;
ALTER TABLE attachment add index (usedin,itemid);

I'm using vb_ as my prefix so its like:

ALTER TABLE vb_attachment add usedin varchar(30) not null;
ALTER TABLE vb_attachment add itemid int not null;
ALTER TABLE vb_pmtext add attach int not null;
ALTER TABLE vb_attachment add index (usedin,itemid);

Heres the "fixed" version:
https://vborg.vbsupport.ru/showthrea...messages+fixed

Working for me on 3.5.4.