The Popcorn e-mail client is no longer actively developed, updated or supported by Ultrafunk in any way.
An unlimited freeware release of the latest version of the Popcorn e-mail client can be downloaded here:

Popcorn 1.84 zip install (252KB)	View Popcorn ReadMe	Windows OpenSLL installer (optional)
Popcorn 1.84 source (288KB)	View Popcorn source ReadMe

The Sonitus:fx DX/VST audio plug-in suite is now developed and sold by Cakewalk, more info is available here.