Hi,

Around when do you plan a bugfix release 1.4.6.1?

thanks,

We hope for a bug fix release soon but we need some more time for a few things. For now you can also try the support build to help find bugs we missed.

Sure, how do I do that?

See the download link for it on our front page on the right. It is not fixed build and changes until we decide it is the bugfix release. But besides that you install it like a normal release. See also:
http://www.zenphoto.org/news/installation-and-upgrading#support-build-vs-development-build (there is no dev build currently)