IKEA Trådfri Gateway outdated for new Pro?

Hi Karl, best and quickest way is asking the developer.

If no support links are provided for, you can search for Robert Hofboer here.
(I tried, nothing…)

Wait. Here’s his github:

When no response in a few weeks or so,
You then can request at Athom if they would contact Robert, and if Robert is willing to transfer the app to an other developer