I see that Piranesi 5.1, for Mac and Windows, has been announced today:
http://www.piranesi.co.uk/products/whats_new.asp
They've posted downloadable 14 day trial versions, too.
Cheers,
Karl
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.6, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB