I believe with the latest update, I am now experiencing an INTERNAL SERVER ERROR, specifically “SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data.”

This occurs ONLY at a download checkout. Checking out with any other type of products works fine.
I isolated this plugin as the culprit by deactivating all plugins and activating one at a time until the error came up again. I haven’t further researched if this is conflicting with some other plugin.