Hi,
We have previously experienced feedback that my plugin doesn’t work with EDD and that was 10 months ago. EDD forum post – the resolution was successful and the user reported success.
Since then, of course, there may have been some changes to EDD and / or my plugin that might have introduced some inconsistency and if that is the case this is the first instance reported to me.
I can only test this on a local installation right now and I did that by installing a fresh copy of WordPress, the latest version of EDD and my plugin, creating a Download and then from the All Downloads screen I was able to click the “Set featured image” link my plugin provides in the Thumb column. After selecting the image and choosing “Use as thumbnail” it was successfully set. So it seems that the plugins can work together. In this case they are the only two plugins active.
Are you able to expand on your experience / issue a little more? Perhaps, if you have other plugins active can you disable them leaving only EDD and my plugin active? Can you see the thumb column in All Posts or All Downloads at all (check Screen options to see if there is a check mark for the thumb column too)
If anyone else is using EDD and considering using my plugin and encountered any or the same issue then please contribute to this ticket or start a new one.
Hopefully with any additional information you can provide we can troubleshoot further to get it working for you in your installation / environment.
Thank you for using my plugin.