The driver (QuadtoneRIP) and the Print Layout program (Print-Tool) are at quadtonerip.com. You do need those as they are required.
The only other thing you need is the Piezography curve archive https://piezography.com/downloads/piezography-community-edition which has all the media profiles you need to start printing + the Piezography Manual for further reading.
You do not need google account or excel, that is the Professional Toolset which is an extra add-on that is optional.
We are working on an actual Piezography Driver that will coalesce all of these different pieces under one tent eventually, but for now, it’s in those there parts: QuadtoneRIP (the driver), Print-Tool (the print layout program), and Piezography Community Edition (the Piezography-specific media profiles).