Greetings,
I was recently looking at my database and noticed that your plugin does not produce tables with the same collation character set as the current version of wordpress.
I was particularly looking at the table wp_sdm_downloads. It is in a charset labled utf8_unicode_ci. My understanding is that the current version of wordpress uses utf8mb4_unicode_ci. I was recently reading the core announcement here: https://make.wordpress.org/core/2015/04/02/the-utf8mb4-upgrade/ and watching https://www.youtube.com/watch?v=yQaRUEwEKxE.
So here is my question: because your table is not using the same collation as WP Core, does that mean that by using your plugin it it opens up a website to security vulnerabilities, of the same type as WP Core had before it was able to handle 4 byte unicode characters?