Yeah, this aeotec rpi incompatibility continues to trip people up. Here’s the write up on why it doesn’t work.
Good news would be at least the old zstick likely works still. If you have access to a windows machine, and you didn’t fully reset the old zstick, the aeotec software I linked above should copy the zwave network from the old Gen 5 zstick to your new gen5+, then the gen5+ stick would work with the rpi4 with the network on it without needing to reinclude devices.