New Multi-Domains ver 1.3.1 has bug

Hello Guys,
I have had raised this in the past but there were not much help and this time I raised here

Looks like I was blaming myself or AWS but eventually it turned out to be that the latest update has a bug (if not must be some wild guess) as after spending 2 days in a row to find out that actually the previous version which is 1.2.3 works perfectly well,luckily I had a back up and some old thread had some instruction how to install it in MU-PLUGIN here

I know it should not require mu-plugin now but since the auto install turned out to be not working this still does the job for me . Could you please look in to this as I've seen various other threads where other members had problems with the update.

Many thanks