Hi,
1. Did the installer complete successfully?
2. Does Corona show up in the Add-On manager in ARCHICAD?
It may happen that your ARCHICAD installation is not detected, in which case the installer displays an error message and copies the add-on files to "C:/Program Files/GRAPHISOFT/ARCHICAD 22/Corona Add-Ons" (depending on your ARCHICAD version). If this happened, you can manually install the add-on by copying the .dll files into the ARCHICAD directory, and the .gmx, .apx and .gdx files into the Add-Ons directory.