@Marvin_S Thanks for the reply. However, the problem is not in getting the installer to run. It is the fact that the installer throws up this error message just before it finishes... Pretty much...

I've tried to install the driver for the `TP-LINK TL-WN823N` from the `TL-WN821N_EUUS_191211_Mac10.15.zip` download. Due to an expired certificate, I had to override the macOS Gatekeeper in System...