All older versions are always accessible: //www.umsyar.com/multiwfn/old/list.htm. This link can also be found from "download" page of Multiwfn website.

The download link for developement version is unchanged until new formal version is officially released.

Hey, would it be possible to get stable URLs for the Multiwfn development versions? Whenever there is a new dev version the old ones become inaccessible. This is somehow a reproducibility problem for me. Could maybe the date be added to the URL so that older versions stay accessible?

Best wishes
Phillip