if upgrading after copying the files to your forum then in admin cp | maintenance | Execute sql query you should run two queries to update the two custom links tables
The following is an example of the queries
number one:
Code:
ALTER TABLE *custom_singlelinks ADD link_perms varchar(100) NOT NULL default ''
number two:
Code:
ALTER TABLE *custom_droplinks ADD link_perms varchar(100) NOT NULL default ''
Notice the * in the query. If you have a table prefix replace the * with the name of your table prefix. If you do not have a table prefix then do not include the * in the alter table sql querys