@Friedchips after getting that pop-up you simply need to go to "System Preferences - Privacy and Security" and click on "allow". Installation works for me but even 1.2.0 from yesterday crashes after a minute or two and I need to unplug and plugin the Ethernet cable. I hope it gets more stable in the next weeks :-/ I tried it on two different MacBook Pros (2016 and 2019 model).

Yesterday, Asix released another binary. It's still at version 1.2.0 but the release date changed. It still stops working after a few minutes.