plugins install, but upgrade gives this error.

Warning

JInstaller: :Install: Error SQL Duplicate column name 'cover' SQL=ALTER TABLE `#__muscol_artists` ADD `cover` VARCHAR(255) NOT NULL AFTER `tags`;
Extension Update: SQL error processing query: DB function failed with error number 1060
Duplicate column name 'cover' SQL=ALTER TABLE `#__muscol_artists` ADD `cover` VARCHAR(255) NOT NULL AFTER `tags`;
SQL =
ALTER TABLE `#__muscol_artists` ADD `cover` VARCHAR(255) NOT NULL AFTER `tags`;
×
Error

Error installing component

well this means this version has already been installed...
can you send me access?

PM sent

Now, it just shows a PDF file with a listing for each.

well, I figured out what was causing this, and fixed.

a whole folder was missing from the installation (a folder called "templates" inside music collection). I have no idea why. did you happen to delete it by accident?

anyway, I simply uploaded this missing folder and now it works. please take a look.

Haven't deleted anything. Must have been the installation.

That fixed that issue, but "permissions" section is blank.