Hi!
In the meantime I’ve spoken to the theme author, he is implementing a modification to the upcoming release. I’m also adding a piece of code to all my plugin releases to make sure it’s working.
I’ve tested the code I’ve provided on a different environment, and it was indeed not working there. I will have to release an update soon to fix that.
I’m attaching the upcoming bugfix version of the search to this post. Please install this one, it has a tiny modification that should help. Also, keep the modification I suggested in the previous post, it should work with the attached plugin version.