I previously tried migrating and changing shortcodes. The files won’t download. I got an error similar to the one reported above, though I can no longer find my previous post here.
I can’t still use 2.6.96 – that’s what I was doing when my host updated for me:
“WP Download Manager has released a new version 2.7.6 for their plugin. A recent hack was found in older versions of this plugin that allows an attacker to execute remote code. This would allow an attacker to insert a backdoor to your WordPress Website (no authentication required).
Over the next 48 hours we will be making every attempt to upgrade your WP Download Manager plugin to the most recent version 2.7.6. We strongly encourage you to check your plugin version(s) to make sure”…etc.
If you ever get it all fixed, let me know – I’ve been up all night switching everything to “Download Monitor”.