Uninstall Problem with “ProBlog - 2.6.9”

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Require assistance uninstalling “ProBlog - 2.6.9”. Unable to make Add-On work without an error or uninstall without another error (see below). Don’t know how to resolve and I don’t want to invest much more time. Please advise how to manually uninstall and which tables to drop from the MySQL database.

An exception occurred while executing 'DELETE FROM AttributeKeys WHERE akID = ?' with params [51]: SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`dga_resources`.`atTextSettings`, CONSTRAINT `FK_951A10CCB6561A7E` FOREIGN KEY (`akID`) REFERENCES `AttributeKeys` (`akID`))