OrilRiver Reverb

Hello everyone, I’m new on this forum.
I have used Cubase Elements 9 for almost a year on my old Mac (OSX Yosemite) and had the OrilRiver reverb vst-plugin installed.
A few days ago I updated to a new Mac (OSX Catalina) and Cubase 10.5.
I tried to install the OrilRiver vst3-plugin several times in the ‘Library/Audio/Plugins/VST3’ file, but with no succes (Cubase refuses the plugin).
Maybe somebody had this issue also and find a solution?

Thanks in advance for helping.