Undefined Index Error

I continue to get the following error even after deactivating, clearing cache, and activating the plugin:

Notice: Undefined index: terms_page in /www/mysite/public/wp-content/plugins/download-manager/libs/class.Package.php on line 218

This was discussed in this support topic, but is still an issue.https://www.ads-software.com/support/topic/error-when-update-today/

Does not occur in Version 3.1.12.

But when updating to Version 3.1.15, the “Notice” appears above the file that is to be downloaded.