What makes you say that? I've just downloaded the C++ source with the GPL licence. The only thing that looks to be missing is the "Donation" version implementa

What makes you say that? I've just downloaded the C++ source with the GPL licence. The only thing that looks to be missing is the "Donation" version implementation of things. Arguably as the author wrote both versions he is well within his rights to set 2 licences. Of course the counter argument is that he's hiding linked source code (the donation edition implementation), and the GPL states he has to make it available owing to linking, which he's failing to do. But there's nothing actually stopping me making changes by reimplementing the Donation edition features, and making those available as per GPL terms too. - Auto updater you probably wouldn't use owing to being a fork and not donating anyway (if you donate, you get the donate version). - Parallel file copy is easy enough with Boost - Portable zip is essentially the same as a static exe build - Email notifications is fairly rudimentary SMTP/email libary use, but would need a basic config dialog.