I managed to get the package from my former colleague which was the fastest way for me.
Currently I can see an option/link "Product not listed? Visit former downloads site" on new download site which redirects to old download site where it is possible now to download ToolChest items including Harvest 1.6 package.
I understand the link works, but that's not good for the new user experience. How are folks supposed to find it when they're coming to the support site and being linked to the tool page and not thinking they have to go scour old forum posts for the link?