Unfortunately, this is a common issue. It seems to not work on Vive controllers either.

I wasn't the one who wrote the script for the Portal Gun, so I don't know how to fix it. To be completely honest, it would be great to have a better version of a working Portal Gun in HLA that isn't as clunky as we have now; I would try to code a new one myself, but I wouldn't even know where to start.

Apologies that you can't play the map. I could ask Adesi again, but they're working on different things now and probably don't want to come back to work on their Portal Gun again.

I'll start work on an update to this addon's map to not need the player to place an orange portal by auto-completing puzzles or whatever else is needed to continue map progression.

I've pushed an update that adds a toggle for automatic orange portal placement.