I try to install the grasshopper live connection for Archicad 25. I get a error saying another version of grasshopper is already installed. to continue you must first uninstall the other version. It is not installed and there no uninstall program coming with grasshopper.
It is correct that it is not possible to install multiple Grasshopper connections in one machine. Before installing a new one, you will need to uninstall the previous one first. To do so, please find the uninstaller from the following location: