Installation into a Raspbian Raspberry PI 3 B+

I expect the answer is that you can’t. As far as I know Fritzing only supports amd64/Intel architectures (Linux, Windows and Macs). Ther Raspberry PI is an ARM. While it should be possible to compile the source for an ARM (assuming Qt supports ARM which I expect it does), I don’t know of anyone having done so though. There are past forum posts about cross compiling but you would have to build from source (which isn’t currently working) though I expect. The am64 version isn’t likely to work (although I’m not an expert on PIs either).

Peter