[Plugin: WP Download Codes] maximum download's reached before 1 download?

when i type in the code and press return I get the following:

WordPress database error: [Unknown column ‘457QZ7C’ in ‘where clause’]
SELECT * FROM wp_dc_releases WHERE ID = 457QZ7C

You have reached the maximum number of allowed downloads for this code. Please refer to the administrator for information about reactivating your code.

https://www.ads-software.com/extend/plugins/wp-download-codes/