I bought this last week and just started using it. It looks like it is Version 1.0.8 June 14, 2019.
I just did it the way I've always done it and selected the php page that had the form on it, then added the parameters where the ID = the hidden form element with the value set using the page recordset ID.
I put your code in and it works, but if I try to make any changes to the update server behavior I get an error now that says the server-side values is improperly coded. I've attached a screen shot.
If I do update the behavior it defaults back to the code on line 47 that wasn't working.